mineral

Polished labradorite

Labradorite, calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Typically gray to dark gray with blue-green iridescent flashes (labradorescence), glassy to pearly luster, and triclinic crystal structure. Hardness is Mohs 6–6.5, with two good cleavage directions and specific gravity about 2.68–2.72.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms in slowly cooled mafic igneous rocks, especially anorthosite, gabbro, and basalt, through feldspar crystallization. Major deposits occur in Precambrian terrains, including Labrador, Canada, Madagascar, Finland, and Norway.

Uses & applications

Used as a cabochon, tumbled stone, carving material, and ornamental facing stone; high-quality pieces are popular in jewelry and metaphysical collections.

Geological facts

Its blue sheen results from light interference between microscopic, compositionally distinct feldspar lamellae. The specimen shown is likely cut and polished, with visible gray-blue labradorescence and natural fractures or veining.

Field identification & locations

Identify it by gray body color, plagioclase cleavage, moderate hardness, and changing blue flash when tilted under directional light; it is commonly sold as polished labradorite from Madagascar or Labrador. A definitive identification may require refractive-index or mineralogical testing.