Diopside

Diopside is a monoclinic pyroxene mineral with composition MgCaSi2O6. It forms complete solid solution series with hedenbergite (FeCaSi2O6) and augite, and partial solid solutions with orthopyroxene and pigeonite. It forms variably colored, but typically dull green crystals in the monoclinic prismatic class. It has two distinct prismatic cleavages at 87 and 93° typical of the pyroxene series. It has a Mohs hardness of six and a specific gravity of 3.25 to 3.55. It is transparent to translucent with indices of refraction of nα=1.663–1.699, nβ=1.671–1.705, and nγ=1.693–1.728. The optic angle is 58° to 63°.
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(n.)
A crystallized variety of pyroxene, of a clear, grayish green color; mussite.
  

General Information:
 Chemical Formula:
CaMgSi2O6
 Composition:
(Molecular Weight = 216.55 gm)
Calcium 18.51 % Ca
Magnesium 11.22 % Mg
Silicon 25.94 % Si
Oxygen 44.33 % O 
 Empirical Formula:
CaMg(Si2O6)
 Environment:
Basic and ultrabasic igneous and metamorphic rocks.
 IMA Status:
Approved IMA 1987
 Locality:
Wide spread occurrence.
 Name Origin:
From the Greek dis - "two kinds" and opsis - "opinion."
Physical Properties:
 Cleavage:
[110] Good, [???] Indistinct
 Color:
blue, brown, colorless, green, or gray.
 Density:
3.25 - 3.55, Average = 3.4
 Diaphaniety:
Transparent to translucent
 Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Blocky - Crystal shape tends to be equant (e.g. feldspars)., Granular - Generally occurs as anhedral to subhedral c rystals in matrix.
 Hardness:
6 - Orthoclase
 Luminescence:
None.
 Luster:
Vitreous (Glassy)
 Streak:
white green
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B: (Kimia) diopsida
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Eng: diopside
Urdu: دو انعطافہ۔ متعدّد رنگوں میں پائی جانے والی آتشی معدن کی ایک قسم جو زیادہ تر پیلے رنگ کی ہوتی ہے۔