Unclassified
Chert
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Unclassified
Chert
Hard, fine-grained sedimentary rock composed of cryptocrystalline silica
epic · Q1070438
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_4.jpg/330px-Gray_shale_%26_bentonites_(Benton_Shale%2C_Upper_Cretaceous%3B_Red_Rock_Canyon_Open_Space%2C_Colorado_Springs%2C_Colorado%2C_USA)_4.jpg)
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