mineral

Polished blue-and-gold mineral specimen, likely labradorite

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

AI-generated identification · may be incorrect

Typically hardness 6–6.5 Mohs, gray to blue body color with blue-gold schiller (labradorescence), vitreous luster, triclinic crystal structure, and two good cleavage directions. The visible piece appears cut or polished, with reflective blue and metallic-gold areas.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms in slowly cooled mafic igneous rocks such as anorthosite, gabbro, and basaltic intrusions through exsolution within feldspar crystals. Major deposits occur in Madagascar, Finland, Canada, Norway, and Russia; specimens generally formed in Precambrian to younger intrusive settings.

Uses & applications

Used as an ornamental stone, cabochons, beads, carvings, and collectible mineral specimens; also used decoratively as architectural stone. It is not generally used as a major construction aggregate when high-quality iridescence is present.

Geological facts

Its color flash results from light interference between microscopic feldspar lamellae, not metallic inclusions. Strong blue labradorescence is especially prized by collectors and lapidaries.

Field identification & locations

Identify it by gray-green feldspar, prominent cleavage, moderate hardness, and shifting blue/gold flashes when tilted; a scratch test and close inspection can distinguish it from coated glass. Common specimens are found in Madagascar and Labrador, Canada.