mineral

Tumbled blue-gray mineral specimen, likely labradorite

Labradorite, a calcium-rich plagioclase feldspar; approximate formula (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; blue-gray body color with possible blue-green iridescent sheen, vitreous to pearly luster, triclinic crystal structure, and two good cleavage directions. The rounded, glossy form indicates tumbling and polishing.

Identified September 13, 2026More mineral →

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At a glance

Common name: Tumbled blue-gray mineral specimen, likely labradorite
Scientific name: Labradorite, a calcium-rich plagioclase feldspar; approximate formula (Ca,Na)(Al,Si)₄O₈
Category: mineral
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Approximately $3–$15 for a small ordinary tumbled piece; $20–$75 or more if it has strong, broad blue or multicolor labradorescence.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Labradorite crystallizes from cooling mafic igneous rocks such as basalt, gabbro, and anorthosite, commonly in Precambrian terrains. The specimen’s exact age and locality cannot be determined from the image.

Uses & applications

Used as a decorative stone, carvings, cabochons, jewelry, countertops, and mineral-collection specimens.

Geological facts

Its characteristic color flashes, called labradorescence, result from light interference within microscopic exsolution layers in the feldspar. Strong blue or multicolor flashes generally increase desirability.

Field identification & locations

Identify it by gray translucent-to-opaque feldspar, hardness near 6, cleavage, and changing blue flashes when rotated under a light; common sources include Madagascar, Finland, Canada, Norway, and Mexico.