Definition
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
Germany
Italy
Discoverer
Van Tooren
Marcus Vitruvius Pollio
Etymology
From Greek tephra, ashes from Indo-European base, to burn
From Italian travertino a kind of building stone, from Tiburs, adjective from Tibur (Tivoli), in Italy
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness 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