Definition
An iron rich extrusive rock found as a member of the alkali basalt magma series
Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase
History
Origin
Isle of Mull, Scotland
Finland, Europe
Discoverer
Ben More
Jakob Sederholm
Etymology
From the name of discoverer, Ben More
From Finnish Rapakivi which stands for crumbly rock
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock