Definition
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
Oil Shale is a fine-grained sedimentary rock from which oil is extracted
History
Origin
Germany
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Discoverer
Christian Leopold von Buch
Unknown
Etymology
From Latin glaber bare, smooth, bald
From Old English scealu in its base sense of thing that divides or separate
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
Family
Group
Plutonic
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Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock