mineral
Red Quartz (Ferruginous Quartz)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
Hardness: 7 on Mohs scale; Color: Reddish-brown, orange-red, or pinkish with white veining; Luster: Vitreous (glassy) to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Reddish-brown, orange-red, or pinkish with white veining
- Luster
- Vitreous (glassy) to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Reddish-brown, orange-red, or pinkish with white veining; Luster: Vitreous (glassy) to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.
Formation & geological history
Formed in hydrothermal veins or as secondary deposits where silica-rich fluids permeate through rock. The red color is derived from iron oxide (hematite) staining or inclusions. They can range in age from millions to billions of years old across various geological eras.
Uses & applications
Primarily used for ornamental purposes, lapidary work (cabochons), landscaping stone, and as metaphysical or 'healing' crystals in the gemstone market.
Geological facts
Red quartz is often referred to as 'Eisenkiesel' by German miners, meaning 'Iron Pebble.' It is frequently mistaken for jasper, but quartz remains translucent in thin sections while jasper is opaque.
Field identification & locations
Identify in the field by its inability to be scratched by a steel knife (hardness 7) and its glassy luster on fresh breaks. Commonly found in iron-rich mining regions or quartz-rich river beds. Collectors should look for vibrant coloration and clarity.
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