mineral

Tumbled aventurine quartz (probable)

Quartz, SiO₂, with fine reflective mineral inclusions—likely aventurine feldspar or mica

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; orange-brown, translucent to opaque, with a polished vitreous luster and subtle aventurescence. Quartz has a trigonal crystal structure and no cleavage, though the rounded shape obscures diagnostic features.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized quartz in igneous or metamorphic cavities and fractures; the orange color may come from iron-bearing inclusions. The specimen is modern tumbled and likely originates from quartz-bearing deposits in India, Brazil, or Madagascar.

Uses & applications

Used primarily as a low-cost lapidary, jewelry, decorative, and collector stone; not generally used structurally.

Geological facts

Aventurescence is caused by light reflecting from tiny plate-like inclusions. Orange varieties are sometimes marketed as orange aventurine, sunstone-look quartz, or iron-stained quartz, but precise identification requires testing.

Field identification & locations

Identify by glassy luster, translucency, rounded conchoidal fracture, and hardness sufficient to scratch ordinary glass; it lacks the strong cleavage and flash typical of feldspar sunstone. Common market value is about $2–$15 for a small tumbled piece, or $20–$75 for attractive larger material.