mineral

Polished blue-orange feldspar (likely labradorite or sunstone)

Plagioclase feldspar, likely labradorite (approximately (Ca,Na)(Al,Si)₄O₈)

AI-generated identification · may be incorrect

Polished oval with blue-gray body color and orange reflective patches, consistent with feldspar iridescence (labradorescence). Feldspar hardness is about 6–6.5 Mohs, with vitreous luster and two prominent cleavage directions; crystal structure is triclinic for plagioclase.

Identified October 8, 2026More mineral →

Explore Polished blue-orange feldspar (likely labradorite or sunstone) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Plagioclase crystallizes as magma cools, commonly in igneous rocks; its age depends on the source deposit. The color play arises from light interference within microscopic mineral layers.

Uses & applications

Used for jewelry, cabochons, decorative objects, and collecting; feldspar is also an important industrial mineral in glass and ceramics.

Geological facts

Labradorite’s shifting blue, green, and gold flashes are called labradorescence and are strongest when viewed at changing angles.

Field identification & locations

Look for angle-dependent flashes on a polished surface and feldspar cleavage; a photo alone cannot securely distinguish labradorite from related feldspar such as sunstone. Labradorite is notably found in Canada, Madagascar, Finland, and Norway.