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Anorthoclase

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Anorthoclase

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Description
Locality: 
Mount Erebus, Ross Island, Victoria Land, Eastern Antarctica, Antarctica
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1.2 × 0.9 × 0.5 cm
Description

Gray anorthoclase cyrstals without matrix from a very unusual locality
 

Mineral Data
What's on the rock

Anorthoclase

Polymorph of: 
Formula: 
(Na,K)AlSi3O8
Group Parent: 
Feldspar Group
Strunz: 
9.FA.30*
Crystal System: 
Triclinic
Hardness: 
6 - 6.5
Colour: 
white, colourless, greyish pink
Streak: 
white
Type Locality: 
Pantelleria Island, Trapani Province, Sicily, Italy

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