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Mineralpedia Details for Labradorite

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Labradorite

Labradorite

A variety of Anorthite feldspar, Labradorite is named for the type locality for the variety on Paul Island off the coast of Labrador, Canada. Uncommon, but widespread, Labradorite can be found in other Canadian localities, in the United States, Mexico, Italy, Finland, Norway, and Iceland among many others. Labradorite exhibits a readily identifiable iridescence with plays of rainbow-esque colors. Labradorite forms in mafic igneous rocks, anorthosites, sometimes in amphibolites, and as detrital grains in sedimentary rock.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/labradorite.pdf

Formula
Na0.5-0.3Ca0.5-0.7Al1.5-1.7Si2.5-2.3O8 
Crystal System
Triclinic 
Crystal Habit
Granular, Crystalline - Coarse, Striated 
Cleavage
Perfect, Good, Distinct 
Luster
Vitreous (Glassy) 
Color
colorless, gray, gray white, white, light green 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
WebMineral
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Mindat
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Labradorite from St. Paul Island, Labrador, Canada

Labradorite
            from St. Paul Island, Labrador, Canada

Blue to yellow play of colors distinguishing this mineral from others in the Feldspar group.

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