mineral

Tumbled green aventurine (probable)

Quartzite composed mainly of quartz (SiO₂) with fuchsite mica inclusions

AI-generated identification · may be incorrect

Pale green, smoothly tumbled, with vitreous-to-waxy luster and faint darker inclusions; quartz hardness about 7 Mohs, no obvious cleavage, granular crystalline texture, specific gravity about 2.6–2.7. The lack of obvious glitter makes chrysoprase or serpentine possible alternatives.

Identified August 31, 2026More mineral →

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Physical properties

Formation & geological history

Usually formed when quartz-rich rock recrystallizes and incorporates green fuchsite mica; commonly Precambrian to Paleozoic quartzite, depending on source. The photographed piece is polished/tumbled and its exact provenance cannot be determined visually.

Uses & applications

Used for inexpensive cabochons, beads, carvings, decorative stone, and lapidary practice; typically modest collector value.

Geological facts

Aventurine’s characteristic aventurescence is caused by reflective mica platelets, though this specimen shows little visible sparkle. Green stones sold as “jade” are often aventurine or serpentine instead.

Field identification & locations

Identify by inspecting under strong angled light for mica sparkle and testing hardness: quartz scratches glass, whereas many serpentine and jade substitutes do not. At 43.5°N, 86.0°W, glacially transported greenstone, serpentine, or quartzite is regionally more plausible than a known source-specific aventurine.