mineral

Polished red-brown feldspar-rich stone, possibly sunstone or aventurine feldspar

Likely potassium feldspar (orthoclase/microcline), KAlSi₃O₈; exact identification requires testing

AI-generated identification · may be incorrect

Typically Mohs 6–6.5, salmon-red to brown, vitreous to pearly luster, and blocky crystal structure with two good cleavages; the specimen appears smoothly tumbled and opaque to slightly translucent. Color may result from hematite or other iron inclusions.

Identified August 31, 2026More mineral →

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At a glance

Common name: Polished red-brown feldspar-rich stone, possibly sunstone or aventurine feldspar
Scientific name: Likely potassium feldspar (orthoclase/microcline), KAlSi₃O₈; exact identification requires testing
Category: mineral
Identified: August 31, 2026
Method: Standard

AI Estimated Value

About $3–$20 for a common tumbled specimen; $25–$150+ if it shows strong aventurescence, translucency, or provenance.

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

Feldspar crystallizes in silica-rich igneous rocks such as granite and pegmatite as magma cools, generally during the Precambrian to Phanerozoic; later weathering produces rounded cobbles. The pictured piece may be a polished lapidary fragment rather than a natural crystal.

Uses & applications

Used mainly as a decorative or collectible stone; feldspar is also important industrially in ceramics, glass, and abrasives. If it has attractive aventurescence, it may be sold as sunstone or aventurine feldspar.

Geological facts

Its identity cannot be confirmed from appearance alone; a streak, hardness, cleavage, and refractive-index test would help distinguish it from quartz, jasper, or dyed agate.

Field identification & locations

Look for salmon color, flat cleavage surfaces, and hardness sufficient to scratch glass but not quartz; common sources include India, Madagascar, Norway, Oregon, and granite-rich regions worldwide. Avoid relying on color alone.