Definition
Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay
Claystone is a fine-grained, dark gray to pink sedimentary rock which mainly consists of compacted and hardened clay
History
Origin
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Discoverer
Unknown
Unknown
Etymology
From German Grauwacke, from grau grey + wacke
From English clay and stone as the rock contains more amount of clay
Class
Sedimentary Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock