metamorphic
Ferruginous Quartz (Iron-stained Quartzite)
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 7 (Mohs scale); Color: Rusty orange/pink to white; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: approx. 2.65.
- Hardness
- 7 (Mohs scale)
- Color
- Rusty orange/pink to white
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Mohs scale); Color: Rusty orange/pink to white; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: approx. 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. The orange/red coloring comes from the infiltration of iron oxides (like hematite or goethite) into the grain boundaries during or after the rock's formation, often in hydrothermal or sedimentary environments.
Uses & applications
Mostly used as gravel, crushed stone for construction, or as pocket stones for collectors. High-quality specimens are sometimes tumbled for lapidary use.
Geological facts
Quartz is the most abundant mineral in the Earth's crust. Iron staining is so common that 'Golden Healer' or 'Hematoid Quartz' are names often used in the metaphysical community for specimens with this specific coloration.
Field identification & locations
Identify in the field by its hardness (it will scratch glass) and its lack of cleavage. It is commonly found in riverbeds, glacial tills, and mountainous regions worldwide where sandstone has been subjected to heat and pressure.
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