Chemical Formula (Na,Ca)1-2Si3-2O8
Color Blue, Red, Green, Yellow, Brown, Purple, Gray, Multicolored
Hardness 6 – 6.5
Crystal System Triclinic
Refractive Index 1.560 – 1.568
SG 2.69 – 2.72
Transparency Transparent to translucent
Double Refraction .008
Luster Vitreous to pearly
Cleavage 2,1 – basal ; 2,1 – prismatic ; 3,1 – pinacoidal.
Mineral Class Labradorite (Anorthite)
Labradorite is named after the Canadian province of Labrador, the classic locality of this gemstone. Labradorite is often heavily flawed with internal dark lines and streaks; stones that are clean of flaws are rare. Some stones have a greater labradorescence effect then others, and a greater play of color increases the value of the Labradorite. A new reddish gemstone popularly called “Andesine” has recently sprung up on the gemstone market; this gemstone is formed by synthetically diffusing certain Labradorite with copper. Care should be handled with Labradorite, as it is sensitive to pressure and can easily crack or chip.
Labradorite is used as cabochons and beads, mainly for necklaces and bracelets, but is also faceted for rings and cut into ornamental objects and spheres.
Red Labradorite – Describes the gemstone Andesine, which is essentially Labradorite that has been artificially colored to a reddish tone by diffusion treatment with copper.
Spectrolite – Variety of Labradorite from Finland that displays a schiller color effect with intense colors such as dark red, orange, yellow, blue, and green.Labradorite gemstones are natural and not treated or enhanced. A new gemstone form given the term Andesine is laboratory-produced by subjecting Labradorite to diffusion treatment.The main sources of Labradorite are Canada (Labrador and Newfoundland), Finland, Ukraine, Madagascar, and Australia.The color effect of Labardorite distinguishes it from all other gemstones.
Lapis Lazuli is a deep blue opaque gemstone, used in antiquity and continuously used throughout the generations. It still continues to be popular today, and remains one of the most important opaque gemstones. Lapis Lazuli is chiefly composed of the mineral Lazurite, with additional other minerals including white Calcite and sparkling specks of Pyrite.
Labradorite TREATMENTS AND ENHANCEMENTS