אורתוקלז – (מיוונית "שבירה ישרה" בשל הזווית בין מישורי הפצילות) הוא מינרל השייך למשפחה של מינרלים בקבוצת הפלדספטים (פצלות השדה) המכילים אשלגן. האורתוקלז נמנה בין המינרלים החשובים ביותר שמהם בנויים סלעי היסוד.

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Noun
1. a white or colored monoclinic feldspar
(hypernym) feldspar, felspar

nm. orthoclase, mineral of the feldspar group consisting of a silicate of potassium and aluminum

(n.)
Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.
  

General Information:
 Chemical Formula:
KAlSi3O8
 Composition:
(Molecular Weight = 278.33 gm)
Potassium 14.05 % K 
Aluminum 9.69 % Al
Silicon 30.27 % Si
Oxygen 45.99 % O 
 Empirical Formula:
KAlSi3O8
 Environment:
Intrusive and extrusive igneous, and metamorphic rocks.
 IMA Status:
Approved IMA 1960
 Locality:
Common world wide occurrences.
 Name Origin:
From the Greek orthos - "right" and kalo -" I cleave" in allusion to the mineral's right angle of good cleavage.
Physical Properties:
 Cleavage:
[001] Perfect, [010] Good
 Color:
colorless, greenish, grayish yellow, white, or pink.
 Density:
2.56
 Diaphaniety:
Transparent to translucent
 Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Massive - Granular - Common texture observed in granite and other igneous rock., Blocky - Crystal shape tends to be equant (e.g. feldspars).
 Hardness:
6 - Orthoclase
 Luminescence:
None.
 Luster:
Vitreous (Glassy)
 Streak:
white
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