Definition
Norite is a mafic intrusive igneous rock composed largely of the calcium-rich plagioclase labradorite, orthopyroxene, and olivine
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
Norway
Italy
Discoverer
Unknown
Marcus Vitruvius Pollio
Etymology
From the Norwegian name for Norway, Norge
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
-
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock