metamorphic
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Hardness: 6.5-7 (Mohs scale); Color: Green (due to Fuchsite mica); Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69. It is known for its 'aventurescence,' a shimmering effect caused by platy mineral inclusions.
- Hardness
- 6
- Color
- Green (due to Fuchsite mica)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Green (due to Fuchsite mica); Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69. It is known for its 'aventurescence,' a shimmering effect caused by platy mineral inclusions.
Formation & geological history
Aventurine is a form of quartzite, a metamorphic rock, formed when quartz crystals are subjected to high heat and pressure, recrystallizing and incorporating mica inclusions. Most green aventurine is found in India, Brazil, and Russia.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, aquarium decorations, and as a popular 'healing stone' in metaphysical practices. It is occasionally used as a decorative building material.
Geological facts
The name 'aventurine' comes from the Italian word 'a ventura,' meaning 'by chance.' This refers to the accidental discovery of aventurine glass (goldstone) in the 18th century, which the natural mineral resembles.
Field identification & locations
Identify in the field by its distinct shimmering metallic reflections (aventurescence) when turned under light. It is commonly found in metamorphic terranes. Unlike green jade, which it is often mistaken for, aventurine has a grainier texture and the distinctive mica sparkle.
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