gemstone
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 7 (Mohs), Color: Light to dark green, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Specific Gravity: 2.64-2.69
Identified More gemstone →
Explore Green Aventurine in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 (Mohs), Color: Light to dark green, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Specific Gravity: 2.64-2.69
Formation & geological history
Formed in metamorphic rocks (phyllite or schist) and igneous rocks. The green color is caused by platy inclusions of chromium-rich mica called fuchsite. Generally found in Precambrian sequences.
Uses & applications
Used extensively for carvings, tumbled stones, jewelry beads, and decorative ornaments. It is a popular stone for lapidary work due to its affordability.
Geological facts
Aventurine is known for the phenomenon called 'aventurescence,' which is a glittering effect caused by tiny inclusions of mica or other minerals. It is often called the 'Stone of Opportunity.'
Field identification & locations
Identify by its characteristic green color and shimmering inclusions. It can be confused with jade or amazonite, but its hardness and sparkly flakes distinguish it. Found primarily in India, Brazil, and Russia.
More like this
Other gemstone specimens
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Amber
Succinite (Organic Gemstone)
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Emerald
Beryl (Be₃Al₂Si₆Oထ₈) with Chromium/Vanadium impurities
gemstone
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
mineral