mineral

Tumbled green aventurine

Quartz (SiO₂), commonly with fuchsite mica inclusions

AI-generated identification · may be incorrect

Typically pale to medium green, vitreous to waxy luster, granular/crystalline texture, no visible cleavage, Mohs hardness about 6.5–7, and specific gravity near 2.65. The uniformly rounded shape indicates machine tumbling and polishing.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Aventurine forms when quartz crystallizes in silica-rich veins or metamorphic rocks, incorporating green fuchsite or other mineral inclusions; its precise age depends on locality. Common sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for inexpensive cabochons, beads, carvings, ornaments, and polished stones; it has minor decorative architectural use. It is popular in crystal collecting and jewelry because it is durable and attractive.

Geological facts

Green aventurine’s subtle shimmer, called aventurescence, comes from reflective mica platelets; this specimen appears relatively fine-grained and may show little visible sparkle. It is often confused with jade, but is generally softer and more granular.

Field identification & locations

Identify it by its green quartz body, possible mica sparkle, hardness sufficient to scratch glass, and lack of jade’s fibrous toughness; a gemological test is needed for certainty. Examine edges under magnification for quartz grains and mica flecks.