mineral

Tumbled orange feldspar (likely sunstone or orange aventurine)

Alkali feldspar, commonly orthoclase or microcline; approximate composition KAlSi₃O₈

AI-generated identification · may be incorrect

Small rounded, polished orange-pink stone with a dull to vitreous luster and pale internal clouding. Feldspar hardness is about 6–6.5 Mohs, with two cleavages near 90°; the image does not show diagnostic crystal faces or aventurescence clearly.

Identified August 31, 2026More mineral →

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At a glance

Common name: Tumbled orange feldspar (likely sunstone or orange aventurine)
Scientific name: Alkali feldspar, commonly orthoclase or microcline; approximate composition KAlSi₃O₈
Category: mineral
Identified: August 31, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common tumbled piece; $20–$100+ if it proves to be gem-quality natural sunstone with strong aventurescence.

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

Formed by crystallization from silica-rich igneous magma, commonly in granite or pegmatite; the geological age depends on its source deposit. Orange color may result from iron-bearing inclusions or hematite.

Uses & applications

Used mainly as a low-cost lapidary and decorative stone; attractive sunstone varieties are used in jewelry, while feldspar is also important industrially in glass and ceramics.

Geological facts

The specimen could alternatively be orange aventurine quartz or a dyed tumbled stone; a photograph alone cannot distinguish these reliably.

Field identification & locations

Check for feldspar’s two cleavages, hardness near 6, and lack of reaction to dilute acid. Common sources include India, Madagascar, Oregon, and Brazil; a streak, refractive index, or specific-gravity test would improve identification.