mineral

Tumbled blue-green stone, likely labradorite

Labradorite, Ca(Al2Si2O8–NaAlSi3O8)

AI-generated identification · may be incorrect

Gray-blue to green, opaque, with a dull to glassy luster and possible subtle labradorescence; hardness 6–6.5 Mohs, triclinic feldspar with two cleavage directions and specific gravity about 2.68–2.72.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as anorthosite, basalt, and gabbro as feldspar cools from magma; most specimens are Precambrian or younger, depending on locality.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, and polished “worry stones”; high-quality material with vivid blue flash has modest jewelry value.

Geological facts

The diagnostic optical effect, labradorescence, is produced by light interference in fine feldspar lamellae and may appear only from certain viewing angles.

Field identification & locations

Common sources include Labrador, Canada; Madagascar; Finland; Norway; and Russia. Identify it by gray body color, feldspar cleavage, moderate hardness, and blue-green flashes when rotated under a strong light; this tumbled piece shows little visible flash.