mineral

Iridescent polished labradorite cabochon

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

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray to blue-gray translucent body with blue, green, and gold schiller (labradorescence); vitreous luster; triclinic feldspar structure and two cleavage directions. The smooth oval shape indicates cutting and polishing.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in mafic igneous rocks such as anorthosite, gabbro, and basalt when feldspar-rich magma cools. Most gem-quality material comes from Madagascar, Finland, Norway, and Canada; the image alone cannot establish age or locality.

Uses & applications

Used for cabochons, beads, jewelry, carvings, and decorative stone. Attractive, strongly flashing specimens commonly sell for about $15–$100; exceptional large Finnish or Madagascar pieces may exceed $200.

Geological facts

Its color flashes result from light interference between microscopic, compositionally distinct feldspar lamellae—not from surface coating. It is often sold under the trade name “spectrolite” when unusually multicolored.

Field identification & locations

Identify by rotating it under directional light: broad blue/green/gold flashes should move across a gray translucent base, while a glassy imitation lacks feldspar cleavage and natural internal texture. The regional prior near Tamaulipas is not diagnostic; labradorite is possible but not especially characteristic of that locality.