Definition
Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
North America
Italy
Discoverer
Theodor von Gümbel
Marcus Vitruvius Pollio
Etymology
From Andes mountains, where it is found in abundance
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
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock