Definition
Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
Finland, Europe
Italy
Discoverer
Jakob Sederholm
Marcus Vitruvius Pollio
Etymology
From Finnish Rapakivi which stands for crumbly rock
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