mineral
Amethyst, Aventurine, and Quartz Mix
Silicon Dioxide (SiO2) with various inclusions/trace elements
Hardness: 7 on Mohs scale. Colors: Purple (Amethyst), Green (Aventurine), White/Clear (Quartz). Luster: Vitreous. Crystal Structure: Hexagonal (Trigonal). Cleavage: None/Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous
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Physical properties
Hardness: 7 on Mohs scale. Colors: Purple (Amethyst), Green (Aventurine), White/Clear (Quartz). Luster: Vitreous. Crystal Structure: Hexagonal (Trigonal). Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed primarily in hydrothermal veins and geode cavities. Amethyst develops its purple hue from irradiation and iron impurities. Aventurine gets its green color from fuchsite inclusions. Rocks can range from millions to hundreds of millions of years old.
Uses & applications
Commonly used in jewelry, ornamental carvings, lapidary projects, and as metaphysical or decorative collection pieces.
Geological facts
Amethyst was considered as precious as diamonds until large deposits were found in Brazil. Aventurine is often called the 'Stone of Opportunity' in folklore.
Field identification & locations
Identify by hardness (should scratch glass), conchoidal fracture, and lack of cleavage. Amethyst is often found in basaltic geodes; Aventurine is frequently found in metamorphic environments like gneisses and schists.
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