metamorphic
Yellow Aventurine
Quartzite with Muscovite/Sericite inclusions (SiO2)
Hardness: 6.5–7 (Mohs). Color: Pale to golden yellow. Luster: Vitreous to waxy. Crystal Structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.63–2.69.
- Hardness
- 6
- Color
- Pale to golden yellow
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs). Color: Pale to golden yellow. Luster: Vitreous to waxy. Crystal Structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.63–2.69.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstones. The yellow hue is typically caused by inclusions of mica (muscovite or sericite) or pyrite during the high-pressure recrystallization process.
Uses & applications
Commonly used for tumbled stones, decorative carvings, beads for jewelry, and occasionally as an ornamental stone in interior design.
Geological facts
While green is the most famous color for aventurine, it naturally occurs in yellow, orange, and blue. The sparkling effect seen in some specimens is known as 'aventurescence,' caused by platy mineral inclusions reflecting light.
Field identification & locations
Identify in the field by its hardness (will scratch glass), lack of visible crystalline faces (microcrystalline), and subtle shimmer from mica inclusions. Common origins include India, Brazil, and Russia.
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