Definition
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
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Italy
Discoverer
Alexandre Brongniart and René Just Haüy
Marcus Vitruvius Pollio
Etymology
From Greek trakhus rough’ or trakhutēs roughness
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, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock