metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 7 (Mohs scale); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Hexagonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69. It is characterized by 'aventurescence,' a shimmering effect caused by platy inclusions.
- Hardness
- 7 (Mohs scale)
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Hexagonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69. It is characterized by 'aventurescence,' a shimmering effect caused by platy inclusions.
Formation & geological history
Formed as a metamorphic rock (quartzite) where quartz-rich sandstone is subjected to high heat and pressure. The green color comes from chromium-rich mica (fuchsite) trapped within the quartz matrix during crystallization. Formation can date back to various geological eras depending on the deposit site, often found in Precambrian shields.
Uses & applications
Primarily used in jewelry (beads, cabochons, carvings), ornamental stone for home decor, and historically for utilitarian items like tool handles. It is a popular 'healing crystal' in the metaphysical community.
Geological facts
Aventurine's name comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to an 18th-century discovery of aventurine glass (goldstone). Natural aventurine was named later because it looked similar to the man-made glass.
Field identification & locations
Identify in the field by its green color and distinct glittering or 'sparkling' inner shine when moved under light. It is commonly found in India, Brazil, Russia, and Tanzania. Collectors should look for even color distribution and strong aventurescence.
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