Anorthosite

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

Availability: In 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.

* Required Fields

Excl. Tax: £1.50 Incl. Tax: £1.80
Description

Details

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.
Reviews

You may also be interested in the following product(s)

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.