41. Many Facets Rock Shop - Geology And Crystallography Books Kansas geology An Introduction to Landscapes, Rocks, minerals Mountains and minerals/Riversand Rocks A Geologist's Snow crystals; WA Bentley; Paperback. http://www.manyfacets.com/mf_bkgeo.html

Many Facets Rock Shop 438 New Karner Road Albany, New York 12205-3810 Books on Geology, Including Information on Specific Areas, States, etc: Click on title for more details. Advances in the Understanding of Crystal Growth Mechanisms ; T. Nishinaga (Editor), et al; Hardcover; Adventures With Rocks and Minerals, Book II : Geology Experiments for Young People (Adventures With Science) ; Lloyd H. Barrow; Library Binding; Adventures with Rocks and Minerals; Geology Experiments for Young People ; Lloyd H. Barrow; Hardcover; Read more about this title... Canyon Country Geology for the Layman and Rockhound ; F.A. Barnes; Paperback; $8.35 (Special Order) Clastic Rocks Associated With the Midcontinent Rift System in Iowa (Strategic and Critical Minerals in the Midcontinent Region, United States, Ch. I) ; Raymond R. Anderson, Robert M. McKay; Hardcover (Not Yet Published) Crystal Growth in Gels ; Heinz K. Henisch; Paperback; Crystal Structure Analysis : A Primer ; Jenny Pickworth Glusker, Kenneth N. Trueblood; Paperback Crystallography in Modern Chemistry : A Resource Book of Crystal Structures ; Thomas C. W. Mak, Gong-Du Zhou; Paperback;

42. Gems Minerals Bibliography minerals, crystals, and Gems Stepping Stones to Inquiry. Rocks and mineralsand Mineral Collecting. http//geology.er.usgs.gov/eastern/rocks.html. http://www.calacademy.org/research/library/biodiv/biblio/gems.htm

California Academy of Sciences Library World Wide Web Books Children's Books Video WORLD WIDE WEB Chemical Compositions of Minerals and Gems http://www.geology.wisc.edu/~jill/mineral.html It’s just like the title sounds. Desert Environment: Minerals and Geology Index http://www.desertusa.com/Thingstodo/geo/geology.html Click on a mineral to find more information. Gemology http://www.geocities.com/Y o semite/trails/3085/Gemmology.htm Links, links, and more links about gemology, the study of gems. Gems and Precious Stones http://www.geology.wisc.edu/~jill/306.html Many images and resources. GeoGem: Gemology Overview http://www.geogem.com/gemmology.htm Very useful information on the gemological properties of gem stones. The Image http://www.theimage.com/ Pictures of minerals and gemstones. The Mineral Gallery http://www.themineralgallery.com/ Descriptions, pictures and information on gemstones and minerals, by name, class, groupings and physical properties. Mineralogy Database http://www.webmineral.com/

43. Oxford Brookes University - Geology - 8320 Petrology - Clastic Minerals Volcanic inclusion rich quartz by observing under high power. It is possibleto distinguish tiny crystals of clay minerals. other feldspars. http://www.brookes.ac.uk/geology/8320/minerals.html

GUIDE TO COMMON CONSTITUENTS OF FRAGMENTAL SEDIMENTARY ROCKS This page is also available as a printed handout. SILICA MINERALS undulose extinction Quartz, SiO Hexagonal, colourless, cleavage generally absent, 1st order birefringence up to pale yellow, low relief, length slow, uniaxial positive. Extinction often undulose or shows 'strain shadows'. Often, quartz grains occur which show uneven or undulose extinction: the crystal does not all go into extinction in one position. This is an effect of distortion of the crystal lattice during tectonic deformation. Normally, this straining occurs prior to incorporation of the grain in the sediment. Stresses in sedimentary sequences are usually insufficient to produce this degree of deformation. Strained quartz may show biaxial figure with low 2V. Inclusions common: e.g. vacuoles, 'negative crystals', tourmaline, mica, hair-like rutile etc. Grains which contain two or more crystals are known as polycrystalline quartz. Very common. Syntaxial secondary overgrowths picked out by 'dust pellicles' are common. A number of quartz types may be recognised: plutonic or common quartz Most abundant type derived from granites and granite-gneisses. May be monocrystalline or polycrystalline. Polycrystalline grains tend to be larger. Undulose extinction common. Inclusions generally uncommon.

44. Geology Of The Tomaree Peninsula. geology of the Tomaree Peninsula, Port Stephens, New South Wales, Australia. coolsrelatively slowly to form a hardwearing rock of minerals and crystals. http://users.hunterlink.net.au/~madms/gelog.html

Geology of the Tomaree Peninsula, Port Stephens, New South Wales, Australia. This information was extracted from my book " Bush Mates , a guide to the wildlife of Nelson Bay". If you would like the latest copy of BUSH MATES , E-MAIL The Port Stephens Visitors Centre (tops@hunterlink.net.au) with your request and they will issue you with instructions on how to get a copy. The book will cost about $18, plus postage. The Port Stephens Visitors Centre can be phoned on 1800808900. In past times this area was a plain which was uplifted 300 metres at the end of the Tertiary period, 10 million years ago. The resulting plateau has been eroded down to it's present level, with the exception of the many hills such as Gan Gan, Glovers Hill etc. remaining at the original level. Port Stephens became an estuary during the Late Pleistocene (70,000 years ago) when the sea level rose about 60 metres. The higher points remained as islands. Since then an emergence of 5 metres has taken place raising some land above the current sea level, about 6000 years ago. Port Stephens is a drowned valley. Before submergence a ridge at Soldiers Point to Middle Island and beyond divided the watershed of the Karuah and Myall Rivers. Before submergence the Karuah River flowed south to join up with the Hunter River system. At that time the Myall River alone flowed into what we now call Port Stephens.

45. Browsing Science Earth Sciences Geology Rocks And Minerals Rockhounding Category ages who share common interests in collecting and working with gems, minerals, jewelry,geology, and fossils. minerals, Specimens and crystals Online link http://www.uksprite.com/search/search/Science/Earth_Sciences/Geology/Rocks_and_M

/* CSS Menu highlight- By Marc Boussard (marc.boussard@syntegra.fr) Modified by DD for NS4 compatibility Visit http://www.dynamicdrive.com for this script */ var ns4class='' WebSearch Low-cost advertising at UKSprite Join Login @UK.Sprite Home Latest Headlines UK Weather World Weather ... UK Travel Guide Fun TV Guide Lotto e-Greetings Mobile Fun Communicate Email Login Get Free Email Free Text Messages Lifestyle Horoscopes Dating Recipes Health Shop DVD's Books Videos More... Deals Auctions Classified Ads Site Map Browsing: Science Earth Sciences Geology Rocks and Minerals Rockhounding Top Science Earth Sciences Geology ... Rocks and Minerals Rockhounding Categories: Rock and Mineral Clubs Related Categories: Science: Earth Sciences: Geology: Rocks and Minerals: Shop Science: Technology: Mining: Prospecting About.com Kids' Collecting Rocks and Minerals page. The starting point for kids, with index of related websites. http://kidscollecting.miningco.com/msub4.htm Preview This Site Agate.com Chronicles of rockhounding trips through Washington, Oregon and Arizona, by Jason Matthiessen; including photos of finds, with links to other sites. http://agate.8k.com/

46. BOOKS - MINERALS, GEOLOGY, GEMOLOGY, FLUORESCENT MINERALS, MICROMOUNTING, FIELD by General geology of the Bergslagen Ore Region, geology of the first discoveredin the Lovozero Massif, fluorescent minerals, giant crystals and data http://www.minresco.com/minbooks/books05.htm

Click on book covers to see larger images. 5-1. "HEAVY MINERALS IN COLOUR" Shipping weight: 2 pounds Price: $205.00 5-2. "HEY'S MINERAL INDEX" Shipping weight: 6 pounds Price: $186.00 5-3. "THE HISTORY OF MINERAL COLLECTING, WITH NOTES ON 1,200 EARLY MINERAL COLLECTORS" Shipping weight: 3 pounds Price: $24.00 5-4. "HUMBOLDT'S TRAVELS IN SIBERIA (1837-1842) THE GEMSTONES" Shipping weight: 2 pounds Price: $25.00 5-5. "IDAHO MINERALS" - By Lanny Ream, 329 pages, 6 X 9" size, illustrated, available in both hard and soft cover editions. "Idaho Minerals" is subtitled "The Complete Reference and Guide to the Minerals of Idaho". This comprehensive book is the first attempt to summarize the mineralogy of Idaho, in 65 years! Special chapters are devoted to the Coeur d'Alene Mining District, the Blackbird Mining District, and the Sawtooth Mountains all areas of special interest to the mineral collector because of their fairly recent production of so many important mineral species. For additional information, see the detailed review in the "Mineralogical Record" magazine, Nov-Dec 1989, P. 489. Published by L. R. Ream Publishing, Coeur d'Alene, ID, 1989. Shipping weight: Hard cover 3 pounds Price: $34.95

47. Geology Adventures - Www.geologyadventures.com - Crystals In The Cascades collect those fabulous minerals seen in museums. We provide tools and instructionsto help you extract beautiful pyrite and quartz crystals, including doubly http://www.geologyadventures.com/spruce.htm

You are here: HOMEPAGE Adventures Spruce Imagine a place where the ground sparkles with crystals of quartz and pyrite. And the land owners are friendly, so you can pick up all you want. Our Spruce claim is a crystal collector's paradise. You can climb into a crystal cavern or learn the techniques to collect those fabulous minerals seen in museums. We provide tools and instructions to help you extract beautiful pyrite and quartz crystals, including doubly terminated, scepters, and phantoms. Access to Spruce requires a strenuous hike: 1,000 feet elevation gain in one-half mile. That's about the energy equivalent of taking the stairs to the 30th floor of an office building. Our "office" is at 3,000 feet in a beautiful mountain valley. You'll hike through an old growth forest, with many stops to admire the view (and catch your breath!). If you are overweight, short of breath, acrophobic, or have knee or back problems, choose another trip. If you have any doubt of your ability to hike to Spruce, go to a high rise building and stairclimb to the 30th floor in 40 minutes. This is how you will feel when you reach the collecting area at Spruce. You´ll need to have enough energy left to swing a hammer! We hike in and out as a group, so the slowest person determines group speed.

48. Education Planet Science And Engineering,Earth Sciences,Geology,Rocks And Minera minerals, Gemstones, Jewelry, Amber, crystals, Agate Geode 4. Cyberwall minerals Information to aid the rock and Annenberg Hooker Hall of geology, Gems, and http://www.educationplanet.com/search/Science_and_Engineering/Earth_Sciences/Geo

Apr. 09, 2003 16:17 PST Search top educational sites, lessons, supplies and more! Membership Log In User Name: Password: Education Planet - TelCom Services Teachers - Receive a second year of Lesson Planet for FREE! ... by choosing our Smart Saver Long Distance Program Top Sites this Week Science: Middle School Physical Science Resource Center Math: Project Interactive Social Science: America at War - Time for Kids Language Arts: International Children's Digital Library Project: Stay Safe Online Lesson Plan: Ready.gov from the Department of Homeland Security Top Sites Archives Educational News Schools Seek to Reassure in Wartime Special Education May Get Overhaul Make-A-Wish Foundation Helps Sick Student Go to College privacy Rocks and Minerals Subcategories: Specific Minerals Most Popular Science and Engineering Searches: Anatomy Geology Invention Marine Biology ... Rocks and Minerals Sponsored Links Slinky Toys - Rocks and Minerals. - Welcome to the world of Poof, Slinky and Slinky Science. Shop now or build your own wish list. Check out our new Mini Labs. Rock Art Images, Prehistoric Southwest Native American Rock Art

49. This Page Has Moved! Exhibit Investigating Rocks and minerals; Watching crystals Grow; and a An extensivealphabetical database file about rocks, minerals, geology information and http://www.madison.k12.wi.us/elib/Themes/Rocks_and_Minerals/

This Page Has Moved! MMSD 's Electronic Library has been reorganized! The links in the category can now be found at: http://www.mmsd.org/elib/elib.cgi?cat=156 Please make a note of it! Thank you, we hope you enjoy the new site!

50. Microsoft BCentral - SurfPoint platinium,PT, gold dredging,gold nuggets,geology,geologic reasearch online catalogof collectible rocks, gems, minerals, fossils, crystals, carved stone http://www.surfpoint.com/Hobbies_Interests/Crafts_and_Hobbies/Rocks_Gems_and_Min

SurfPoint Home Crafts and Hobbies : Rocks Gems and Minerals 36 sites total - Artigian jewels production Badali Jewelry - On-line catalog of handcrafted jewelry and gift items; Tolkien theme jewelry, Gold mining jewerly, celtic jewelry, Golden-Lined Crystaline Geodes, Frog jewelry, Custom RUNE rings, etc. Beads-n-Rocks by Berrie - bead jewelry artist Brysons Rock Shop - Gem and Lapidary Supplies Cliff Freeman's Pro-Pan - Cliff Freeman's Pro-Pan: Simple innovation for superior gold panning results. Links and resources for all you need to know about gold panning. CSM Gem Lab - An independent appraisal firm Earth Moods Photo and Minerals - Commercial, stock and fine art photography - Fine mineral specimens for mineral collectors of all ages. Eclectic Etc. Jewelry and Beading Supplies - Jewelry and beading supplies at wholesale prices. Our wide selection includes: jewelry kits, ceramic, glass, wood and seed beads and findings plus some helpful information. El Paso Gold Prospectors Association - Local Chapter of the Gold Prospectors Association of America Etcetera: A bimonthly arts and crafts webzine.

51. UWRF Geology - Dr. Bill Cordua phosphates, such as struvite and newberryite are rare minerals generally found Struviteforms colorless crystals lining cracks in the stones formed under http://www.uwrf.edu/~wc01/Kidney.html

Minerals from Kidney Stones Rockhounds are often told that they have rocks in their head. It turns out that the human body does make lots of minerals. Bones and teeth are two obvious examples. We may argue that these aren't minerals by strict definition, because they are made by living organisms not inorganically, but they are otherwise the same as minerals found in rocks. When I was a graduate student at Indiana University, my office mates were helping with a research project on minerals in kidney stones (which are concretions technically called urinary calculi). They received daily packages of rather disgusting samples from many hospitals which they saw fit to open and analyze in my prescence. One of my old office mates, Dick Gibson, wrote up a summary of the minerals they found. The most common minerals were, not surprisingly, phosphates. These include apatite, brushite and whitlockite. Apatite is the most common mineral in many kidney stones, forming crumbly to solid white, yellow or brownish masses. Various forms of apatite were interlayered, like the layers in hailstones. Brushite occurs as tabular to bladed yellow to white crystals typical of kidney stones formed under more acidic conditions. Whitlockite forms amber to brown coatings on some stones, and is particularly common in prostatic stones. Two calcium oxalates, whewellite and weddellite are abundant in kidney stones. Outside the body, these minerals are rare, found most often on the deep sea floor, in coal seams and in sedimentary nodules. In kidney stones the whewillite forms globular to radiating masses of crystals while weddellite forms sharp dipyramidal crystals up to 5 mm long (ouch).

52. Mineralogy Mineralogy An Introduction to the Study of minerals and crystals. New York McGrawHill,1928. McGraw-Hill Dictionary of geology and Mineralogy. http://www.ericweisstein.com/encyclopedias/books/Mineralogy.html

Mineralogy Berry, L.G. and Mason, Brian. Mineralogy: Concepts, Descriptions, Determinations. San Francisco, CA: W.H. Freeman, 1959. 630 p. $?. Burns, Roger G. Mineralogical Applications of Crystal Field Theory, 2nd ed. London: Cambridge University Press, 1993. 551 p. Classic textbook. $85. Chatterjee, Niranjan D. Applied Mineralogical Thermodynamics: Selected Topics. Berlin: Springer-Verlag, 1991. 321 p. $59. Correns, Carl W. Berlin: Springer-Verlag, 1949. 414 p. Deer, W.A.; Howie, R.A.; and Zussman, J. An Introduction to the Rock-Forming Minerals. London: Longman,1975. 528 p. 2nd ed by Zussman. Now in 2nd ed. Fleischer, M. and Mandarino. Glossary of Mineral Species 1991, 6th ed. Tucson, AZ: The Mineralogical Record 1991. 256 p. Updated annually. $18. Gaines, Richard V.; Skinner, H. Catherine W.; Foord, Eugene E.; Mason, Brian; and Rosenzweig, Abraham (Eds.). Dana's New Mineralogy: The System of Mineralogy of James Dwight Dana and Edward Salsbury Dana, 8th ed. New York: Wiley, 1997. 1872 p. $250. Hochleitner, Ruppert.

53. Buy Geology And Rockhounding Books From Amazon.co.uk cover The New Penguin Dictionary of geology cover McGrawHill Dictionary of geologyand cover A Field Guide to Rocks and minerals cover crystals http://website.lineone.net/~webrex/buybooks.html

Navigate this site using the drop-down menu below! (Alternativly, use the sitemap Home What's New at BashRox... News Section (geology and more) Collections (author's specimens) Mineral Identification (guide and tables) Guide to Keeping Records (also applies to field notebooks) Buy Minerals! Glossary Links Contributors About BashRox Site Map Trophy Cabinet (Awards BashRox has Won) Minerals, Gemstones, Mineral Identification and more... The New Penguin Dictionary of Geology McGraw-Hill Dictionary of Geology and... An Introduction to the Rock-forming... A Colour Atlas of Rocks and Minerals in... ... New Mexico Rockhounding : A Guide to... Palaeontology, Fossil Identification and more... Taking Wing Atlas of the Prehistoric World Dinosaurs Walking with Dinosaurs: the Facts ... The Selfish Gene Travel, World Locations... Other Items... Search: All Products Books Popular Music Classical Music Video DVD Electronics Software Keywords:

54. The Educational Encyclopedia, Geographic-geology minerals and crystals. Mineral and gemstone kingdom minerals, rock, crystal,rocks, gem, gemstone, mineralogy, gemology, geology, rockhound, guide http://users.pandora.be/educypedia/education/geologyminerals.htm

Science Animals Biology Botany Bouw ... Resources Geology Disasters Earthquakes General overview Geysers Minerals Miscellaneous topics Volcanoes Volcano list Minerals and crystals Athena mineralogy alphabetical list of minerals with formula and system, mineral database, pictures of minerals, a tip Atlas of igneous and metamorphic minerals, rocks, and textures Crystal shape laboratory crystal java applets Crystal structural models using chime plug-in diamond and graphite, metal, salt, carbonates, garnet, Al2SiO5 polymorphs, beryl, pyroxene, amphibole, mica, SiO2 polymorphs, quartz Crystallography and minerals arranged by crystal form crystallography groups are composed of 32 classes of symmetry derived from observations of the external crystal form Crystallography 101 X-ray crystallography Fluroescent minerals pictures of fluorescent minerals photographed under long wave (LW) or short wave (SW) ultraviolet light, images Gem and precious stones image gallery Igneous rocks igneous rocks are formed by crystallization from a liquid, or magma

55. Listings Of The World Science Earth Sciences Geology Rocks Rhode Island Books on geology. http//www.spheresbygeorge.com/ Added Nov-27-02;Steiner's Rockshop Post Review crystals, minerals, rocks, and gemstones. http://listingsworld.com/Science/Earth_Sciences/Geology/Rocks_and_Minerals/Shop/

56. Mesa State Geology Courses (Alternate Spring). GEOL 325 Introduction to Engineering geology (3). Morphologyand classification of crystals; chemistry and genesis of minerals. http://www.mesastate.edu/snsm/geology/academics/degindx/course.htm

Course Descriptions GEOL 100 Survey of Earth Science (3) Physical makeup of the earth, its history, and geology. One field trip is required. Intended for students with majors other than one of the sciences. (Fall/Spring) GEOL 103 Weather and Climate (3) Non-mathematical introduction to elements of local and global weather: the atmosphere, cloud formation, precipitation, seasons, optical phenomena and violent storms. Students practice making 24-hour weather forecasts. (Fall/Spring) GEOL 104 Oceanography (3) Non-mathematical introduction to the scientific study of the ocean. While the course focuses on the hydrosphere subsystem of the Earth System, the atmosphere, cryosphere, lithosphere and biosphere interrelationship with hydrosphere are also examined. (Spring) GEOL 105 Geology of Colorado (3) Introduction to minerals, rocks, geologic time scale and basic geologic terms, followed by geology of Colorado taught with the aid of slides and overheads. A one-day field trip is required. (Fall/Spring) GEOL 107 Natural Hazards and Environmental Geology (3) Introduction to geologic aspects of our environment. Includes studies of natural hazards, global climate change, geologic resources and emphasizes human interactions with the environment. (Spring)

57. Rockhounding In Science > Earth Sciences > Geology of all ages who share common interests in collecting and working with gems, minerals,jewelry, geology, and fossils. minerals, Specimens and crystals. http://ilectric.com/browse/web/Science/Earth_Sciences/Geology/Rocks_and_Minerals

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58. Awesome Library - Science Provides pictures and information on minerals, crystals, and gems 01; Earth News A Diary of the Planet (EarthWeek); Earth Sciences and geology Lessons, Resources http://www.awesomelibrary.org/Classroom/Science/Earth_Sciences/Earth_Sciences.ht

Awesome Talking Library Examples ... U.S. Department of Peace Here: Home Classroom Science > Earth Sciences Earth Sciences Sub-Topics Earthquakes and Plate Tectonics Maps Mountains and Volcanoes Rivers ... The Weather Also Try Ancient History Dinosaurs and Fossils Geography Discussions Ask the Earth Scientist Lesson Plans Earth Forces - Grade 10 (British Columbia Ministry of Education) Provides a lesson plan for the 10th grade level. The materials are called an Integrated Resource Package. 2-01 Earth Science and Geology Lessons - Grade 11 (British Columbia Ministry of Education) Provides lessons on Earth and Its Environment (Introduction), Geological Science (Earth Materials), (Weathering and Erosion), (Tectonics and Vulcanism), (Tectonics and Earthquakes), (Resources and Environment), Oceanographic Science (Oceans), Atmospheric Science (The Atmosphere), (Pressure and Winds), (Evaporation, Precipitation, and Weather), and Earth's History (Geologic Time). For the 11th grade level. The materials are called an Integrated Resource Package. 2-01 Earth Science and Geology Lessons - Grade 12 (British Columbia Ministry of Education) Provides lessons on Earth Materials (Introduction to Geology), (Minerals), (Igneous Rocks and Processes), (Sedimentary Rocks and Processes), (Metamorphic Rocks and Processes), (Mineral, Rock, and Energy Resources), Time and the Fossil Record (Relative Dating), (Absolute Dating), (Geologic Time Scale), (The Fossil Record), Internal Processes and Structures (Plate Tectonics), (Seismology), (Isostasy), (Earth's Interior), and (Structural Geology), Surficial Processes (Weathering and Erosion), (Running Water), (Glaciers), and (Ground Water). For the 12th grade level. The materials are called an Integrated Resource Package. 2-01

59. Introduction To Minerals Examples p. 40-41 quartz pyrite. Quartz crystals. Density. C. Chemical classificationof minerals. Return to Outline. Return to Physical geology Online page. http://www.gpc.peachnet.edu/~pgore/geology/geo101/mineral.htm

Introduction to Minerals Pamela J. W. Gore Georgia Perimeter College Objectives 1. Distinguish between rocks and minerals. 2. Distinguish the three basic subatomic particles, understand atomic mass, atomic number, radioactivity, isotopes, and ions. 3. Describe the various type of bonding in chemical compounds (ionic, covalent, metallic). 4. Describe the process of crystallization in minerals. 5. Distinguish the physical properties that are useful in identifying minerals. 6. List the eight most common elements of the earth's crust. 7. Briefly describe the silicon-oxygen tetrahedron. 8. List and distinguish among the common silicate minerals. 9. List the economic uses of some common minerals. 10. Describe the chemical classification of minerals. Outline Definitions Physical Properties of Minerals Chemical Properties of Minerals Basics of Chemistry ... Silicate Structures Definitions Mineral Naturally occurring Inorganic Solid Definite chemical composition Orderly internal crystal structure Examples?

60. Metamorphic Rocks Forms elongated crystals with a rounded triangular crosssection Know which mineralsare the metamorphic index minerals. Return to Physical geology Online page. http://www.gpc.peachnet.edu/~pgore/geology/geo101/meta.htm

Metamorphic Rocks Pamela J. W. Gore Georgia Perimeter Collegee Objectives List the agents of metamorphism and briefly describe the effects of each agent. Briefly describe the textural differences exhibited by metamorphic rocks (foliated, non-foliated). Describe the use of index minerals in the interpretation of metamorphic zones. Discuss the types of metamorphism. Discuss the relationship between metamorphism and plate tectonics. Metamorphism means "changed form". Agents of Metamorphism Changes occur because of: Heat Pressure Chemical fluids Rocks adjust to become more stable under new, higher temperatures and pressures. Heat There are several sources of heat for metamorphism. Geothermal gradient Temperature increases with depth at a rate of 20 - 30 degrees C per km in the crust. Ultimate source of the heat? Radioactive decay. Increase of temperature and pressure with depth causes Regional Metamorphism Heat may come from large bodies of molten rock rising under a wide geographic area. Intrusions of hot magma can bake rocks as it intrudes them. Lava flows can also bake rocks on the ground surface.

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