Definition
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
Mudstone is a fine-grained, dark gray sedimentary rock, which is formed from silt and clay and is similar to shale but has less laminations
History
Origin
Germany
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Discoverer
Christian Leopold von Buch
William Smith
Etymology
From Latin glaber bare, smooth, bald
From the English mud and stone, from low German mudde and stainaz
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