mineral
Red Quartz / Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 7 on Mohs scale; Color: reddish-orange, pinkish-red, to brownish-red; Luster: vitreous to greasy; Crystal Structure: trigonal/hexagonal; Cleavage: none; Specific Gravity: ~2.65
- Hardness
- 7 on Mohs scale
- Color
- reddish-orange, pinkish-red, to brownish-red
- Luster
- vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: reddish-orange, pinkish-red, to brownish-red; Luster: vitreous to greasy; Crystal Structure: trigonal/hexagonal; Cleavage: none; Specific Gravity: ~2.65
Formation & geological history
Formed through hydrothermal precipitation or primary magmatic processes, with subsequent staining or inclusions of iron oxides such as hematite or goethite giving it its characteristic reddish hue.
Uses & applications
Used primarily for lapidary work, decorative specimens, cabochons, tumbling, and gemstone collections. Pure quartz is also used in electronics and glassmaking.
Geological facts
Red quartz is often referred to as 'tangerine quartz' or 'ferruginous quartz' depending on whether the iron staining is external or embedded as internal hematite inclusions.
Field identification & locations
Identified by its scratch resistance (scratches glass easily), lack of cleavage, conchoidal fracture, and characteristic red/orange color. Commonly found in riverbeds, quartz veins, and gravel deposits worldwide.
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