mineral

Polished rainbow moonstone

Moonstone, typically orthoclase feldspar (KAlSi₃O₈), often with albite intergrowths; the pictured material may be sold as gray moonstone or labradorite depending on composition.

AI-generated identification · may be incorrect

Mohs hardness 6–6.5; translucent gray-beige body with blue-white sheen (adularescence), vitreous to pearly luster, monoclinic feldspar structure, and two cleavages near 90°. The polished oval shows characteristic internal sheen and layering.

Identified October 13, 2026More mineral →

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At a glance

Common name: Polished rainbow moonstone
Scientific name: Moonstone, typically orthoclase feldspar (KAlSi₃O₈), often with albite intergrowths; the pictured material may be sold as gray moonstone or labradorite depending on composition.
Category: mineral
Identified: October 13, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small, common polished cabochon; stronger blue sheen or larger, well-cut stones may sell for more.

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

Forms as feldspar crystallizes in cooling, silica-rich igneous rocks; microscopic intergrowths scatter light to create adularescence. Such rocks formed throughout geologic time, commonly in granites and pegmatites.

Uses & applications

Cabochons and beads for jewelry, carvings, and mineral collecting; feldspar itself is also widely used in ceramics and glass.

Geological facts

Moonstone’s floating glow is called adularescence, caused by light scattering between feldspar layers.

Field identification & locations

Look for a soft, moving blue or white glow beneath the surface rather than glittering surface inclusions. Moonstone occurs in Sri Lanka, India, Myanmar, Madagascar, and elsewhere; this polished piece cannot be reliably distinguished from related feldspars by appearance alone.