Definition
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
Rhyolite is a fine-grained igneous rock which is rich in silica
History
Origin
Italy
North America
Discoverer
Marcus Vitruvius Pollio
Ferdinand von Richthofen
Etymology
From Italian travertino a kind of building stone, from Tiburs, adjective from Tibur (Tivoli), in Italy
From German Rhyolit, from Greek rhuax lava stream + lithos stone
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, Opaque Rock