Definition
Phonolite is an uncommon extrusive igneous rock volcanic rock of intermediate chemical composition between felsic and mafic
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
-
-
Discoverer
Unknown
William Smith
Etymology
From the Greek meaning sounding stone because of the metallic sound it produces if an unfractured plate is hit
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
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock