English
Image:Orthoclase Hornblende.jpg|thumb|Orthoclase

Alternative spellings
Sanidine
Adularia

Etymology
ortho (from Greek orthos, straight, perpendicular) + clase (from Greek klastos, broken, to break).

Noun
orthoclase

1. mineralogy A common feldspar of igneous, plutonic, and metamorphic rocks. Orthoclase is the main feldspar of pegmatite occurrences, where it is most commonly flesh-colored. Orthoclase is used in the ceramic and glass industries and as a decorative gravel.

Physical properties:
*Moh's Hardness: 6.0
*Specific gravity: 2.6
*Color: white, flesh, yellow, brown, occasionally colorless
*Luster: glassy
*Fracture: conchoidal
*Cleavage: two good at 90º
*Habit: Monoclinic - prismatic. Well developed crystal faces are at 90º to each other. Occasional twinned crystals are found. Crystal faces typically look polished, and are not striated.

Related terms
:See rock, mineral, pegmatite

Translations

Bulgarian: о��оклаз (ortoklaz)
Chinese: 正��
Dutch: orthoklaas
German: Orthoklas m
Hebrew: ��רת�ק�� (�rt�qlaz)
Japanese: 正��
Korean: ��� (j��.ja�.s�g)
Polish: ortoklaz
Portuguese: ortoclase
mid
Russian: о��оклаз (ortoklaz)
Serbian:
*Cyrillic: о��оклаз
*Roman: ortoklaz
Slovak: ortoklas
Spanish: ortoclasa f
Swedish: ortoklas
Vietnamese: oc-to-cla

vi:orthoclase
zh:orthoclase

• 2007-09-05 15:26 - Rhanyeia - picture

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