Definition
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
History
Origin
Pennines, England
Germany
Discoverer
J.J. Ferber
Christian Leopold von Buch
Etymology
From Grit + Stone
From Latin glaber bare, smooth, bald
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
-
Plutonic
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock