Definition
Granite is a very hard, granular, crystalline igneous rock which consists mainly of quartz, mica, and feldspar and is often used as building stone
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
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Discoverer
Alexander von Humboldt
William Smith
Etymology
From Italian granito, which means grained rock, from grano grain, and from Latin granum
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