Definition
Definition
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers called coal beds
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
History
Origin
USA
Pennines, England
Discoverer
John Peter Salley
J.J. Ferber
Etymology
From the Old English term col, which has meant mineral of fossilized carbon since the 13th century
From Grit + Stone
Class
Sedimentary Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Family
Group
Not Applicable
Not Applicable
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock
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