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Topaz

           
 
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TOPAZ
Gemstone:
Shape:
Weight (ct):
 to
 
 
Topaz Facts
Category Silicate mineral
Chemical formula Al2SiO4(F,OH)2
Identification
Color Clear (if no impurities), blue, brown, orange, gray, yellow, green, pink and reddish pink.
Crystal system orthorhombic
Cleavage [001] Perfect
Fracture conchoidal
Mohs Scale hardness 8
Luster Vitreous
Refractive index nα = 1.606 - 1.629 nβ = 1.609 - 1.631 nγ = 1.616 - 1.638
Optical Properties Biaxial (+)
Birefringence δ = 0.010
Pleochroism Weak in thick sections
Streak White
Specific gravity 3.49 - 3.57
Diaphaneity Transparent
Other Characteristics Fluorescent, short UV=golden yellow, long UV=cream