1 Definition
1.1 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
1.2 History
1.2.1 Origin
1.2.2 Discoverer
Van Tooren
Marcus Vitruvius Pollio
1.3 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
1.4 Class
Igneous Rocks
Sedimentary Rocks
1.4.1 Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
1.5 Family
1.5.1 Group
1.6 Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock