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| Geologic Reference Library | |||
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Geologic Time Line Don't know the Paleozoic from the Permian? When did the dinosaurs roam? What was happening on the third rock 4500 million years ago? Find out here |
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Mineral
Library Probably the largest mineralogical reference. with over 9,600 different minerals, varieties and synonyms listed, along with their occurrences and locations. |
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Glossary Alphabetical listings of rock, mineral, gem, and geologic terms with their definitions for anyone interested in rocks and lapidary. |
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Mineral Identification Rock and mineral collectors use several physical property tests to help identify an unknown mineral. Learn what they are and how to use them. |
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Hardness Scales Was Moh just one of the 3 Stooges? Learn about mineral hardness, how it is used by rock collectors, and other methods used to determine hardness. |
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Crystal Systems How does this help an ordinary rockhound to identify minerals? Understanding mineral symmetry is very helpful in identifying crystals. |
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Periodic Table An interactive periodic table with links to individual elements properties, history, uses, sources and other useful information. |
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Common Conversions Conversions value and formulas found and used in lapidary and rock literature, gemology, geology, and in the related earth sciences. |
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Rocks in the News Wonder what current rock, lapidary, gem, and geology related stories are in the news? Learn what's up in the world of rocks, gems and rock related science fields. |
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Cave and Karst Databases Searchable databases for cave and sinkhole locations in the US and countries around the world |
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