And, because many rocks vary widely in their appearance we are, over time, going to add as many different examples of a type as we can find.
The page is organized by the various classification systems.
Basic classification - alphabetical (next) Basic classification - by method of origin QFL classification of clastic rocks Carbonate rocksBasic Classification - Alphabetical
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Breccia Chalk limestone Chert Coal - bituminous Coal - anthracite Conglomerate Coquina |
Dolomite Fossil limestone Gypsum Halite (rock salt) Intraclastic limestone Micrite limestone Oolitic limestone |
Peat Rock Salt (halite) Sandstone Shale Siltstone |
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Clastic
BrecciaConglomerate Sandstone Shale Siltstone |
Chemical
ChertDolomite Gypsum Halite (rock salt) Limestone - micrite Limestone - oolitic Limestone - intraclastic Rock Salt (halite) |
Biochemical
ChalkCoal - bituminous Coal - anthracite Coquina Limestone - chalk Limestone - fossiliferous Peat |
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Arkose breccia Arkose conglomerate Arkose sandstone Lithic conglomerate Lithic sandstone Lithic breccia |
Quartz sandstone Quartz conglomerate Sandy quartz conglomerate Sandy wacke Shale |
Siltstone Wacke sandstone Wacke quartz conglomerate |
Carbonates come in such variety and diversity that only the main types are listed here. Mixed types are forced into one category or another. Also, some rock types are much more common than others and thus some rocks listed below are not represented. We have also mixed rock names from different keys although they may refer to the same thing.
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Biomicrite Biosparite Chalk Coquina Dolomite |
Encrinite Fossil limestone Intramicrite Intrasparite Micrite |
Oomicrite Oosparite Pelmicrite Pelsparite |