Definition
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
Pennsylvania, U.S.
Italy
Discoverer
Unknown
Marcus Vitruvius Pollio
Etymology
From Greek anthrakites, from anthrax, anthrak meaning coal
From Italian travertino a kind of building stone, from Tiburs, adjective from Tibur (Tivoli), in Italy
Class
Metamorphic Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
-
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock