mineral

Likely polished labradorite or another feldspar-rich stone

Labradorite, a plagioclase feldspar: approximately (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Small rounded, polished dark-gray specimen with pale reflective patches; feldspar hardness is about 6–6.5 Mohs, with vitreous luster and two cleavage directions. The image does not show enough detail to confirm its identity or any characteristic blue-green labradorescence.

Identified October 2, 2026More mineral →

Explore Likely polished labradorite or another feldspar-rich stone in the encyclopedia →

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Physical properties

Formation & geological history

Labradorite typically crystallizes as plagioclase in cooling mafic igneous rocks, often in ancient intrusive complexes. The specimen’s specific source and age cannot be determined from the photo.

Uses & applications

Used as an ornamental stone in jewelry, carvings, and polished collectibles; feldspar is also an important industrial mineral.

Geological facts

Labradorescence—broad, shifting flashes of color—comes from light interference within fine internal layers; it is not clearly visible here.

Field identification & locations

Check for blue, green, or gold flashes when tilting under a point light, and compare with hardness and cleavage tests; similar-looking polished stones can be difficult to distinguish visually. Labradorite occurs in Canada, Finland, Madagascar, and elsewhere.