mineral

Tumbled green aventurine (probable)

Quartz (SiO₂), commonly with fuchsite mica inclusions

AI-generated identification · may be incorrect

Pale green, translucent to opaque, with a waxy-to-vitreous luster and irregular healed fractures; quartz hardness is about 7 Mohs, with no cleavage and a trigonal crystal structure. The rounded shape indicates tumbling or polishing.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Typically forms in metamorphic or hydrothermal quartz veins, where chromium-bearing fuchsite or other minerals color the quartz; deposits are commonly Precambrian to younger. The image alone cannot confirm composition, and it could also be green chalcedony or serpentine.

Uses & applications

Used for beads, carvings, cabochons, tumbled stones, and ornamental objects; generally inexpensive and not a major industrial material.

Geological facts

Aventurine’s characteristic “aventurescence”—sparkly reflections from mica—is weak or absent in this specimen. Stronger identification requires a close inspection, hardness test, and specific-gravity or mineralogical testing.

Field identification & locations

Common sources include India, Brazil, Russia, Tanzania, and China. Look for mica sparkle and quartz-like hardness; it should scratch ordinary glass but not be scratched by a steel knife. Avoid destructive testing on valuable pieces.