Definition
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
Oolite is a sedimentary rock formed from ooids, spherical grains which are composed of concentric layers of calcite
History
Origin
Pennines, England
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Discoverer
J.J. Ferber
William Smith
Etymology
From Grit + Stone
From oo- + -lite, after German Oolit. A rock consisting of fine grains of carbonate of lime
Class
Sedimentary Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
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Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock