metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 7 on Mohs scale; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69. It features aventurescence, a shimmering effect caused by platy mineral inclusions.
- Hardness
- 7 on Mohs scale
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69. It features aventurescence, a shimmering effect caused by platy mineral inclusions.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sedimentary rocks (sandstone). During the recrystallization of quartz, chromium-rich mica (fuchsite) is trapped within the crystal structure, creating the green hue and sparkly appearance.
Uses & applications
Primarily used for ornamental purposes, including beads, cabochons, carvings, and tumbled stones for jewelry and decorative objects. It is also a popular specimen for crystal collecting and metaphysical practices.
Geological facts
The name 'Aventurine' is derived from the Italian word 'a ventura,' meaning 'by chance,' originally referring to the 18th-century accidental discovery of 'goldstone' glass which looks similar. Green aventurine is the most common variety of this stone.
Field identification & locations
Identify by its characteristic green color and 'aventurescence' (internal sparkles). It is commonly found in India, Brazil, and Russia. In the field, look for a quartz-like rock that doesn't scratch easily with a steel blade and exhibits a distinctly shimmering, mossy green interior.
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