mineral

Tumbled labradorite

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

AI-generated identification · may be incorrect

Typically gray to blue-gray with dark inclusions and a polished surface; hardness 6–6.5 Mohs, vitreous luster, triclinic crystal structure, and two good cleavage directions. The image suggests labradorite, though iridescent flash is not clearly visible.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Forms in cooling mafic igneous rocks such as basalt, gabbro, and anorthosite through slow crystallization of feldspar-rich magma. Most specimens are Precambrian to younger, depending on locality.

Uses & applications

Used as an ornamental stone, tumbled collectible, cabochon, architectural facing, and occasionally in jewelry; it is not a major industrial aggregate when sold as gem material.

Geological facts

Its characteristic blue, green, gold, or violet sheen—labradorescence—comes from microscopic intergrowth layers within the feldspar. The specimen appears polished or tumbled rather than naturally weathered.

Field identification & locations

Identify it by gray body color, feldspar-like hardness, cleavage, and blue or multicolor flash when rotated under a strong light; common sources include Madagascar, Finland, Canada, Norway, and Russia.