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Claystone is a fine-grained, dark gray to pink sedimentary rock which mainly consists of compacted and hardened clay
From English clay and stone as the rock contains more amount of clay
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock
Talc carbonate is nothing but a rock sequence or a mineral composition found in metamorphic ultramafic rocks.
From medieval Latin, talcum
Fine Grained Rock, Opaque Rock