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Tourmaline

           
 
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Los Angeles, CA 90014

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TOURMALINE
Gemstone:
Shape:
Weight (ct):
 to
 
 
Tourmaline Facts 
Category Silicate mineral group
Chemical formula (Ca,K,Na,[])(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6
(BO3)3(Si,Al,B)6O18(OH,F)4
[1]
[2]
Identification
Color Clear (if no impurities); also see Varieties
Crystal habit 6-sided prism ending in 6-sided pyramid (typical)
Crystal system rhombohedral class 32
Twinning Dauphine law, Brazil law and Japan law
Cleavage None
Fracture Conchoidal
Mohs Scale hardness 7 - lower in impure varieties
Luster Vitreous/glossy
Refractive index nω = 1.543 - 1.545 nε = 1.552 - 1.554
Optical Properties Uniaxial (+)
Birefringence +0.009 (B-G interval)
Pleochroism None
Streak White
Specific gravity 2.65 constant; variable in impure varieties
Melting point 1650 (±75) °C
Solubility 11.0 +/- 1.1 PPM @ 25 C
Diaphaneity Transparent to translucent
Other Characteristics Piezoelectric