mineral

Tumbled blue-gray stone beads, likely labradorite or dyed quartz

Probable labradorite (plagioclase feldspar; approximately NaAlSi₃O₈–CaAl₂Si₂O₈), though exact identification requires testing

AI-generated identification · may be incorrect

Hardness about 6–6.5 Mohs for labradorite; blue-gray, translucent to opaque, vitreous luster, granular crystal structure, and two cleavage directions. The rounded, glossy surfaces indicate tumbling and polishing; visible blue flashes would support labradorite, while uniform color may indicate dyeing or another stone.

Identified August 10, 2026More mineral →

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At a glance

Common name: Tumbled blue-gray stone beads, likely labradorite or dyed quartz
Scientific name: Probable labradorite (plagioclase feldspar; approximately NaAlSi₃O₈–CaAl₂Si₂O₈), though exact identification requires testing
Category: mineral
Identified: August 10, 2026
Method: Standard

AI Estimated Value

$5–$30 per strand; approximately $1–$10 per bead, with premium high-flash specimens higher.

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 in slowly cooled mafic igneous rocks such as basalt, gabbro, and anorthosite, typically in Precambrian to younger intrusive settings. It commonly forms through magmatic crystallization and later weathering releases pieces into sediment.

Uses & applications

Used as ornamental stone, beads, cabochons, carvings, and collector specimens; it has limited construction use. Similar blue-gray tumbled stones are inexpensive jewelry materials.

Geological facts

Labradorescence—bright blue, green, or gold internal flashes caused by light interference across feldspar lamellae—is the key diagnostic feature. A refractive index, hardness, and dye test can distinguish it from dyed quartz or glass.

Field identification & locations

Common sources include Labrador, Canada; Finland; Madagascar; Norway; and Russia. Typical bead value is about $5–$30 for a strand, or $1–$10 per bead; verified high-flash material may cost more.