mineral

Tumbled labradorite (possible)

Labradorite, a plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Smooth, rounded, polished gray-brown stone with muted blue-gray patches; no distinct flash is visible, so identification from the photo is uncertain. Labradorite has hardness 6–6.5, a vitreous-to-pearly luster, triclinic crystals, and two good cleavage directions; specific gravity is about 2.7.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Labradorite forms in igneous rocks, especially anorthosite and basaltic intrusions, as magma cools; its exact age depends on its source. The location near 30.1°N, 95.8°W is in a sedimentary region, so a naturally local labradorite pebble would be unusual and it may be a brought-in tumbled specimen.

Uses & applications

Used as a decorative stone, in jewelry, and by mineral collectors; feldspar is also important in ceramics and glassmaking.

Geological facts

Labradorescence—bright blue, green, or gold internal flashes caused by light interference in fine layers—is its best-known feature, but it is not apparent in this image.

Field identification & locations

Turn it under a strong light to check for colored flashes; a feldspar-like hardness and cleavage can support the ID. Common sources include Canada, Madagascar, Finland, and Norway; confirm with a mineral test if no flash appears.