metamorphic
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Hardness: 6.5–7 (Mohs scale); Color: Green, bluish-green, orange-brown; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64–2.69
- Hardness
- 6
- Color
- Green, bluish-green, orange-brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Green, bluish-green, orange-brown; Luster: Vitreous to waxy; Crystal Structure: Trigonal (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), where high pressure and temperature cause recrystallization and the integration of mica or hematite platelets.
Uses & applications
Primarily used for jewelry (beads, cabochons), ornamental carvings, home decor, and as a popular 'healing stone' in metaphysical collections.
Geological facts
Aventurine displays a unique optical phenomenon called 'aventurescence,' which is a shimmering effect caused by the reflection of light off tiny plate-like inclusions within the stone. Its name is derived from the Italian word 'a ventura,' meaning 'by chance.'
Field identification & locations
Identify in the field by its distinct speckles and shimmering effect under light, which distinguishes it from Jade or Chalcedony. Commonly found in India, Brazil, and Russia. Collectors should look for vibrant even color and high aventurescence.
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