Sedimentary
Sedimentary rocks form from the accumulation and lithification of sediments. They often contain fossils and are classified as clastic, chemical, or organic based on their formation process.
22 specimens in this category
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Arkose
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Breccia
Chalk
Chert
Hardness: 6.5 - 7
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Coal
Concretion
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Conglomerate
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Diatomite
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Dolomite Rock
Hardness: 3.5 - 4
Greywacke
Hardness: 6 - 7
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Ironstone Concretion
Limestone
Hardness: 3 - 4
Mudstone
Hardness: 2 - 3
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Oil Shale
Hardness: 2 - 3
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Omarolluk
Hardness: 6 - 7
Pisolite
Radiolarite
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Sandstone
Hardness: 6 - 7
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Septarian Stone
Hardness: 3.5 - 4
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Shale
Hardness: 3
Siltstone
Hardness: 6 - 7
Stromatolite
Hardness: 3 - 4
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