Definition
Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
England
Italy
Discoverer
Abraham Gottlob Werner
Marcus Vitruvius Pollio
Etymology
From Old French esclate, from esclat (French éclat)
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, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
-
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock