mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with hematite/limonite inclusions
Hardness: 7 (Mohs scale); Color: Rusty red, orange-brown, or yellow-brown; Luster: Vitreous to dull; Crystal structure: Trigonal; Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Rusty red, orange-brown, or yellow-brown
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Mohs scale); Color: Rusty red, orange-brown, or yellow-brown; Luster: Vitreous to dull; Crystal structure: Trigonal; Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or sedimentary environments where iron oxides (hematite or goethite) coat or penetrate quartz crystals during or after growth. Common across all geological ages.
Uses & applications
Used primarily as a collector specimen, in metaphysical practices, or occasionally as a decorative stone in landscaping.
Geological facts
The red color is caused by the same iron oxides that make rust. It is often called 'Hematoid Quartz' or 'Ferruginous Quartz' depending on the iron concentration.
Field identification & locations
Identify by its hardness (scratches glass) and its characteristic iron-stained exterior over a translucent quartz core. Often found in gravel pits, riverbeds, or mining tailings.
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