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Microcline

Origin Of Name:
From the Greek word ‘micros’ means ‘small’ and ‘Klinein’ means ‘to lean’, referring to this mineral’s cleavage angles being 90⁰.

Copyright: Britannica.com

Physical properties:
. Hardness: 6
. Cleavage: perfect on(001) , good on(010)
. Specific gravity: 2.56
. Fracture: Irregular/uneven
. Luster:  Vitreous
. Transparency: Transparent to translucent
. Colour: white to pale yellow, more rarely red    or green
. Streak: white

Crystal system: Triclinic
Occurence:
. Microcline is a prominent constituent of igneous rocks such as: granite and syenite that cooled slowly at and at considerable depth.
. In sedimentary rocks it is present in: Arkose and Conglomerate.
. In metamorphic rock present in: gneiss.
. It is a common K-feldspar of Pegmatites. 
Uses: Feldspar is used chiefly in the manufacture of Porcelain.
. A small amount of feldspar is used in the manufacture of glass to contribute alumina to the batch.
. It is used as ornamental lapidary material with amazonite in green color.  

Reference:

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