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