mineral
Tumbled Aventurine and Smoky Quartz (Ametrine variant)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Luster: Vitreous; Colors: Green (Aventurine) and Purple/Yellow (Ametrine); Crystal Structure: Trigonal/Hexagonal; Cleavage: None (Conchoidal fracture).
- Hardness
- 7 (Mohs scale)
- Luster
- Vitreous
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Physical properties
Hardness: 7 (Mohs scale); Luster: Vitreous; Colors: Green (Aventurine) and Purple/Yellow (Ametrine); Crystal Structure: Trigonal/Hexagonal; Cleavage: None (Conchoidal fracture).
Formation & geological history
Formed in hydrothermal veins or pegmatites where silica-rich fluids cool and crystallize. Green aventurine gets its color from fuchsite inclusions, while ametrine forms from iron impurities and temperature variations during crystal growth.
Uses & applications
Commonly used in tumbled stone jewelry, decorative carvings, metaphysical healing practices, and as collector specimens.
Geological facts
Aventurine is known for the phenomenon called aventurescence, a shimmering effect caused by inclusions. Ametrine is a rare natural combination of Amethyst and Citrine in the same crystal.
Field identification & locations
Identify by hardness (it will scratch glass), color distribution, and the presence of characteristic inclusions under magnification. Frequently found in Brazil, India, and Bolivia.
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