Definition
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
Arkose is a sedimentary rock, specifically a type of sandstone containing at least 25% feldspar
History
Origin
Germany
France
Discoverer
Van Tooren
Alexandre Brongniart
Etymology
From Greek tephra, ashes from Indo-European base, to burn
From Auvergne region of France used by a French geologist Alexandre Brongniart in 1826 who applied this term to some feldspathic sandstones
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
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Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock