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