gemstone

Dark cabochon gemstone, likely labradorite

Labradorite, plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

AI-generated identification · may be incorrect

The polished oval cabochon is gray-green to blue-gray with possible weak blue-green labradorescence and a vitreous-to-pearly luster. Hardness is about 6–6.5 Mohs; cleavage is distinct in two directions, crystal structure monoclinic/triclinic feldspar, and specific gravity about 2.68–2.72.

Identified September 11, 2026More gemstone →

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Physical properties

Formation & geological history

Labradorite crystallizes in mafic igneous rocks such as basalt, gabbro, and anorthosite as magma cools. Important gem material comes from Madagascar, Finland, Canada, Norway, and parts of India; the Karachi-area region is more commonly associated with sedimentary rocks and imported lapidary stones.

Uses & applications

Used as ornamental cabochons, beads, carvings, and jewelry. This mounted stone has modest commercial value unless it displays strong, broad blue flash and has good clarity and polish.

Geological facts

Its color play is caused by light interference from microscopic lamellae within the feldspar. The image alone cannot exclude moonstone, dark chalcedony, or glass imitation.

Field identification & locations

Confirm with a flashlight from different angles: genuine labradorite should show directional blue/green flashes, often with internal cleavage or cloudy zones. A refractive-index, hardness, and specific-gravity test would distinguish it reliably.