Definition
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Etymology
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A yellow sandstone which is flexible when cut into thin strips
From the name of a mountain range where it was found; Itacolumi mountain in Brazil
Coarse Grained Rock, Fine Grained Rock, Opaque Rock
Oil Shale is a fine-grained sedimentary rock from which oil is extracted
From Old English scealu in its base sense of thing that divides or separate
Fine Grained Rock, Opaque Rock