Definition
Origin
Discoverer
Etymology
Class
Sub-Class
Group
Other Categories
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
Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay
From German Grauwacke, from grau grey + wacke
Fine Grained Rock, Opaque Rock