mineral

Possible labradorite pebble

Labradorite, a calcium-sodium feldspar in the plagioclase series ((Ca,Na)(Al,Si)₄O₈)

AI-generated identification · may be incorrect

The smooth blue-gray stone shows possible blue and reddish iridescence (labradorescence), but the photo alone cannot confirm its identity. Feldspar hardness is about 6–6.5 Mohs, with vitreous luster and two cleavage directions near 90°; crystal structure is triclinic.

Identified October 9, 2026More mineral →

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Physical properties

Formation & geological history

Labradorite crystallizes in igneous rocks, especially gabbro and anorthosite, as magma cools; such rocks range from Archean to recent. The rounded shape suggests natural abrasion or tumbling.

Uses & applications

Labradorite is used for jewelry, carvings, decorative stone, and mineral collecting; as a rock-forming feldspar, it also occurs in some construction stone.

Geological facts

Its color flashes result from light interference within fine internal layers in the feldspar, not surface paint.

Field identification & locations

Look for shifting blue, green, or gold flashes as the stone is tilted, plus feldspar cleavage; common sources include Labrador, Canada, Madagascar, Finland, and Norway. The image does not show enough detail for a confident identification.