Definition
Carbonatite is intrusive or extrusive igneous rock which is defined by mineralogic composition, consisting of greater than 50 percent carbonate minerals
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
History
Origin
Tanzania
Pennines, England
Discoverer
Unknown
J.J. Ferber
Etymology
From any intrusive igneous rock, having a majority of carbonate minerals
From Grit + Stone
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Family
Group
Plutonic
-
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock