metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
Hardness: 7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal (massive); Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.69. It is characterized by 'aventurescence,' a shimmering effect caused by platy mineral inclusions.
- Hardness
- 7 (Mohs)
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal (massive); Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.69. It is characterized by 'aventurescence,' a shimmering effect caused by platy mineral inclusions.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sedimentary rocks (sandstone), where intense heat and pressure recrystallized the quartz and integrated chromiferous mica (fuchsite). These deposits are often found in Precambrian metamorphic terrains.
Uses & applications
Predominantly used for lapidary work, including jewelry (beads, cabochons), ornamental carvings, figurines, and as a popular 'healing stone' in metaphysical collections. It is also used as a decorative stone in landscaping and aquariums.
Geological facts
The name 'Aventurine' is derived from the Italian 'a ventura,' meaning 'by chance.' This refers to the accidental discovery of goldstone (aventurine glass) in the 18th century, which looks very similar to this natural stone.
Field identification & locations
Identify in the field by its distinct green shimmer (aventurescence) and quartz-like hardness. It is commonly found in India (the primary source), Brazil, Russia, and Tanzania. Look for it in metamorphic schist formations where mica is present.
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