metamorphic
Yellow Aventurine
Quartzite with Muscovite/Sericite inclusions (SiO2 + KAl2(AlSi3O10)(OH)2)
Hardness: 7 Mohs; Color: Pale to honey yellow; Luster: Vitreous to waxy with aventurescence; Crystal structure: Trigonal/Hexagonal (Microcrystalline); Cleavage: None; SG: 2.63 - 2.65
- Hardness
- 7 Mohs
- Color
- Pale to honey yellow
- Luster
- Vitreous to waxy with aventurescence
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Physical properties
Hardness: 7 Mohs; Color: Pale to honey yellow; Luster: Vitreous to waxy with aventurescence; Crystal structure: Trigonal/Hexagonal (Microcrystalline); Cleavage: None; SG: 2.63 - 2.65
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite. The yellow hue and metallic finish come from inclusions of tiny mica flakes (muscovite or sericite) being trapped during the recrystallization process.
Uses & applications
Used primarily for metaphysical purposes, gemstone carvings, cabochons for jewelry, and as decorative figurines or worry stones.
Geological facts
The term 'aventurescence' comes from the Italian word 'a ventura', meaning 'by chance', originally referring to accidental glass shavings falling into a melt to create goldstone.
Field identification & locations
Identify in the field by its quartz-like hardness and the characteristic 'shimmer' caused by internal mica flakes. Found mostly in India, Brazil, and parts of Russia.
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