Definition
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
Germany
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Discoverer
Van Tooren
William Smith
Etymology
From Greek tephra, ashes from Indo-European base, to burn
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
Volcanic
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Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock