یاقوت
یاقوت ایک گلابی رنگ کا پتھر ہے۔
یاقوت | |
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A naturally occurring ruby crystal | |
General | |
Category | Mineral variety |
Formula (repeating unit) | ایلومینا with کرومیئم, Al2O3:Cr |
Crystal system | Trigonal (Hexagonal Scalenohedral) Symbol (-3 2/m) Space Group: R-3c |
Identification | |
Color | Red, may be brownish, purplish or pinkish |
Crystal habit | Varies with locality. Terminated tabular hexagonal prisms. |
Cleavage | No true cleavage |
Fracture | Uneven or conchoidal |
Mohs scale hardness | 9.0 |
Luster | Vitreous |
Streak | white |
Diaphaneity | transparent |
Specific gravity | 4.0 |
Refractive index | nω=1.768 - 1.772 nε=1.760 - 1.763, Birefringence 0.008 |
Pleochroism | Orangey red, purplish red |
Ultraviolet fluorescence | red under longwave |
Melting point | 2044 °C |
Solubility | none |
Major varieties | |
Sapphire | Any color except red |
Corundum | various colors |
Emery | Granular |