Anorthosite - Norway
Excl. Tax: £1.50 Incl. Tax: £1.80

Availability: Out of stock

Pure white Bergen Arc anorthosites from Rogaland province, Voss, Western Norway. Supplied in a 2"x2" 3"x2" 4"x3" card tray with a label.


Anorthosite is a phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar (90–100%), and a minimal mafic component (0–10%) including Pyroxene, ilmenite, magnetite, and olivine. Anorthosite can be divided into two main types according to age. Proterozoic & Archaen. This example from Western Norway falls into the former group. Most anorthosite plutons are very coarse grained; that is, the individual plagioclase crystals and the accompanying mafic mineral are greater than a few centimeters long. However, most Proterozoic anorthosites are deformed, and such large plagioclase crystals have recrystallized to form smaller crystals, leaving only the outline of the larger crystals behind.

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