Definition
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
Wehrlite is an ultramafic and ultrabasic rock that is a mixture of olivine and clinopyroxene. It is a subdivision of the peridotites
History
Origin
Pennines, England
Egypt
Discoverer
J.J. Ferber
Alois Wehrle
Etymology
From Grit + Stone
From the name of a professor, Alois Wehrle
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Plutonic
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock