Definition
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
Germany
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Discoverer
Christian Leopold von Buch
William Smith
Etymology
From Latin glaber bare, smooth, bald
From Old French marle, from Late Latin marglia
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