mineral

Tumbled light-green quartz, likely aventurine or prehnite

Quartz (SiO₂), possibly green aventurine; visual identification is uncertain

AI-generated identification · may be incorrect

Mohs hardness about 6.5–7; pale green, translucent, vitreous-to-waxy luster, commonly massive rather than visibly crystalline, with no obvious cleavage. The rounded surface and polish indicate human tumbling.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Quartz-bearing material formed in hydrothermal veins or metamorphic rocks; green color may result from fuchsite mica (aventurine) or epidote inclusions. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used as an ornamental stone, inexpensive cabochon, bead, and lapidary material; typically a low-cost collector specimen.

Geological facts

The pictured basket contains assorted tumbled stones, so the displayed piece may also be pale-green calcite or prehnite rather than quartz. A scratch test, refractive index, and specific gravity would distinguish them.

Field identification & locations

Quartz usually scratches glass and shows a glassy luster; calcite is softer (Mohs 3) and reacts with dilute acid, while prehnite is commonly more waxy and has hardness 6–6.5. Common sources include Brazil, India, Madagascar, and South Africa.