Definition
Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
History
Origin
Finland, Europe
Germany
Discoverer
Jakob Sederholm
Christian Leopold von Buch
Etymology
From Finnish Rapakivi which stands for crumbly rock
From Latin glaber bare, smooth, bald
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Plutonic
Plutonic
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock