රතුකැට

විකිපීඩියා, නිදහස් විශ්වකෝෂය වෙතින්
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රතුකැට
Natural ruby crystals from Winza, Tanzania
General
CategoryMineral variety
රසායනික සූත්‍රයaluminium oxide with chromium, Al2O3:Cr
Identification
පාට / පැහැයRed, may be brownish, purplish or pinkish
Crystal habitVaries with locality. Terminated tabular hexagonal prisms.
Crystal systemTrigonal (Hexagonal Scalenohedral) Symbol (−3 2/m) Space Group: R-3c
CleavageNo true cleavage
FractureUneven or conchoidal
Mohs scale hardness9.0
LusterVitreous
Streakwhite
Diaphaneitytransparent
Specific gravity4.0
Refractive indexnω=1.768 – 1.772 nε=1.760 – 1.763, Birefringence 0.008
PleochroismOrangey red, purplish red
Ultraviolet fluorescencered under longwave
Melting point2044 °C
Solubilitynone
Major varieties
SapphireAny color except shades of red
Corundumvarious colors
EmeryGranular
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