یاقوت

آزاد دائرۃ المعارف، ویکیپیڈیا سے
:چھلانگ بطرف رہنمائی، تلاش
Ruby
A naturally occurring ruby crystal
General
Category Mineral variety
Chemical formula aluminium oxide with chromium, Al2O3:Cr
Identification
Color Red, may be brownish, purplish or pinkish
Crystal habit Varies with locality. Terminated tabular hexagonal prisms.
Crystal system Trigonal (Hexagonal Scalenohedral) Symbol (-3 2/m) Space Group: R-3c
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

نگار خانہ[ترمیم]