metamorphic
Aventurine (Green)
Silicon Dioxide (Quartz) with inclusions typically of Fuchsite; SiO2
Hardness: 6.5–7 (Mohs scale); Color: Pale to dark green with a shimmering effect (aventurescence); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (Microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.64–2.69
- Hardness
- 6
- Color
- Pale to dark green with a shimmering effect (aventurescence)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Pale to dark green with a shimmering effect (aventurescence); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (Microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.64–2.69
Formation & geological history
Formed through the regional metamorphism of quartz-rich sedimentary rocks (sandstone) into quartzite. During recrystallization, platy mineral inclusions like mica (fuchsite) become trapped, creating its signature sparkle. Most deposits date from the Precambrian era.
Uses & applications
Predominantly used for ornamental purposes, jewelry (beads, cabochons), carvings, and as a popular 'healing stone' in metaphysical practices. Also used for decorative landscape stones and floor tiles.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance.' This refers to the accidental discovery of 'aventurine glass' or goldstone in the 18th century, which looks very similar to this natural stone.
Field identification & locations
Identify by its 'aventurescence' (internal metallic-looking glimmers) and its hardness, as it will easily scratch copper or glass. It is commonly found in India, Brazil, Russia, and Tanzania. Collectors look for evenness of color and intensity of the sparkle.
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