Definition
Peridotite is a dense, coarse-grained plutonic is the main constituent of the earth's mantle
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
Pike County, U.S
-
Discoverer
Unknown
William Smith
Etymology
From French, from peridot + -ite
From Old French marle, from Late Latin marglia
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
Plutonic
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Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock