Definition
Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
USA
Italy
Discoverer
Unknown
Marcus Vitruvius Pollio
Etymology
Rhyo lite + dacite : a rock intermediate between rhyolite and dacite that is the extrusive equivalent of granodiorite
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
-
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock