mineral

Tumbled labradorite (likely)

Labradorite, calcium-sodium feldspar: (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Polished gray-green, translucent feldspar with cloudy internal bands and possible weak blue-green flash; vitreous-to-pearly luster, triclinic crystal structure, Mohs hardness 6–6.5, good cleavage, and specific gravity about 2.68–2.72.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms in slowly cooled mafic igneous rocks, especially gabbro and anorthosite, through feldspar exsolution and recrystallization. Most gem-quality material is associated with Precambrian anorthosite complexes, though the specimen’s exact age and locality cannot be determined from the image.

Uses & applications

Used as a decorative gemstone, cabochon, tumbled stone, and ornamental facing material; large labradorite slabs are used in interior design.

Geological facts

Its characteristic labradorescence results from light interference in microscopic feldspar lamellae; the strongest blue flashes appear only at favorable viewing angles.

Field identification & locations

Identify by gray body color, feldspar cleavage, hardness, and blue-green iridescence that changes with orientation; common sources include Madagascar, Finland, Canada, Norway, and Russia.