microcline

Microcline (KAlSi3O8) is an important igneous rock forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slow cooling of orthoclase; it is stable at lower temperatures than orthoclase. Sanidine is a polymorph of alkali feldspar stable at yet higher temperature. Microcline may be clear, white, pale-yellow, brick-red, or green; it is generally characterized by cross-hatch twinning that forms as a result of the transformation of monoclinic orthoclase into triclinic microcline.
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(n.)
A mineral of the feldspar group, like orthoclase or common feldspar in composition, but triclinic in form.
  

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:
Granitic pegmatites, hydrothermal and metamorphic rocks.
 Locality:
Common world wide occurrences.
 Name Origin:
From the Greek mikron - "little" and klinein - "to stoop."
Physical Properties:
 Cleavage:
[001] Perfect, [010] Good
 Color:
bluish green, green, gray, grayish yellow, or yellowish.
 Density:
2.56
 Diaphaniety:
Translucent to transparent
 Habits:
Blocky - Crystal shape tends to be equant (e.g. feldspars)., Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
 Hardness:
6 - Orthoclase
 Luminescence:
Non-fluorescent.
 Luster:
Vitreous (Glassy)
 Streak:
white
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Eng: microcline
Urdu: قائمہ شگاف سے مُشابہ ۔ مائیکرو کلائِن