Definition
Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay
Carbonatite is intrusive or extrusive igneous rock which is defined by mineralogic composition, consisting of greater than 50 percent carbonate minerals
History
Origin
-
Tanzania
Discoverer
Unknown
Unknown
Etymology
From German Grauwacke, from grau grey + wacke
From any intrusive igneous rock, having a majority of carbonate minerals
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
Family
Group
-
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock