Definition
Granite is a very hard, granular, crystalline igneous rock which consists mainly of quartz, mica, and feldspar and is often used as building stone
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
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Italy
Discoverer
Alexander von Humboldt
Marcus Vitruvius Pollio
Etymology
From Italian granito, which means grained rock, from grano grain, and from Latin granum
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
Plutonic
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Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock