Geology Superstore
Geology Superstore

Anorthosite Slide

£18.00 ex VAT

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. These thin sections exhibit a rock which has been deformed and as such the once large plagioclase crystals have recrystallized to form much smaller crystals.

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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. These thin sections are cut from proterozoic material collected from Western Norway Falls. Although anorthosite plutons are very coarse grained most Proterozoic anorthosites are deformed thus large plagioclase crystals have recrystallised to form smaller crystals, as evidenced by our examples. The original grain shape and fabric has clearly been destroyed and left behind are much smaller crystals. Each section is made to 30 microns thickness and the glass is 46 x 27 mm in size with a cover slip. Supplied in a protective card sleeve with a label, ideal for microscopy.

Weight 80 g

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