mineral
Tangerine Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
Hardness: 7 (Mohs scale); Color: Orange, rust, gold; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Orange, rust, gold
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 (Mohs scale); Color: Orange, rust, gold; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed through the hydrothermal deposition of silica and the oxidation of iron minerals. The distinct orange color is caused by a surface coating of iron oxide (hematite or rust) that bonded to the quartz as it grew or after it formed, often in Madagascar or Brazil.
Uses & applications
Metaphysical and spiritual purposes, mineral collection, jewelry making, and ornamental decoration.
Geological facts
The orange color is a natural surface coating rather than an internal impurity. If soaked in certain acids, the orange coating can be stripped away, revealing clear quartz underneath.
Field identification & locations
Identify by the classic six-sided quartz crystal points and the characteristic 'rust' orange color that does not scratch off easily but may be lighter in protected crevices. Found primarily in Santinho, Brazil and parts of Madagascar.
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