Gemstones Tools

Labradorite

Gray labradorite cabochon
(lab'-ra-dor-I-t')

18th c.; geo. labrador

Feldspar with opalescent reflects, originally found on labrador coast in Canada
Color
Semi-transparent to opaque white to dark gray
Family
Feldspar
Chemical composition
Na(AlSi3O8)Ca(Al2Si2O8)
Crystal system
Triclinic
Hardness (Mohs scale)
6 - 6,5
Specific gravity
2,70 ±0,05
Refractive index
1,559 - 1,568
Birefringence
0,009
Optical character
Biaxial +
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