Definition
Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay
A water-soluble mineral sediment resulting from concentration and crystallization by evaporation from an aqueous solution
History
Origin
-
USA
Discoverer
Unknown
Usiglio
Etymology
From German Grauwacke, from grau grey + wacke
From a sediment left after the evaporation
Class
Sedimentary Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
Family
Group
-
-
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock