mineral

Tumbled blue-gray stone, likely labradorite

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

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray to blue-gray with possible blue labradorescent flashes, vitreous luster, triclinic crystal structure, and two good cleavage directions. The rounded shape indicates tumbling or polishing.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms in slowly cooled mafic igneous rocks such as anorthosite, basalt, and gabbro; notable deposits are Precambrian in age, especially in Canada and Madagascar.

Uses & applications

Used as a decorative stone, cabochon, beads, carvings, and architectural facing; attractive specimens have modest jewelry and collecting value.

Geological facts

Its blue sheen, called labradorescence, results from light interference within microscopic lamellae caused by feldspar exsolution.

Field identification & locations

Look for gray body color and shifting blue, green, or gold flashes when rotated under a strong light; confirm with hardness and cleavage tests. Common sources include Labrador, Canada; Madagascar; Finland; and Norway.