metamorphic
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5 - 7 on Mohs scale. Color: Forest to sea green with shimmering specks. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.64 - 2.69.
- Hardness
- 6
- Color
- Forest to sea green with shimmering specks
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5 - 7 on Mohs scale. Color: Forest to sea green with shimmering specks. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.64 - 2.69.
Formation & geological history
Formed as a metamorphic recrystallization of quartz sedimentary rocks containing mica or iron minerals. The distinctive green color and aventurescence come from tiny platey inclusions of green fuchsite mica. Formation can range from hundreds of millions to billions of years ago.
Uses & applications
Extensively used for lapidary work including beads, cabochons, and small sculptures. It is popular in the 'healing crystal' market and occasionally used as a decorative construction material for tiles or fireplace surrounds.
Geological facts
Aventurine derives its name from the Italian 'a ventura' (by chance), originally referring to a type of glass invented in the 18th century that accidentally mimicked this stone's shimmering appearance. This shimmer is scientifically termed 'aventurescence'.
Field identification & locations
Identify in the field by its green color combined with a subtle metallic glitter or 'platy' reflection under light. Found commonly in Brazil, India, Russia, and Tanzania. Collectors should look for even color distribution and strong mica reflections.
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