metamorphic
Pyritic Quartzite
Quartzite with Pyrite inclusions (FeS2)
Hardness: 6-7 Mohs; Color: Light grey to white matrix with brassy metallic flecks; Luster: Vitreous to metallic; Cleavage: None; Structure: Granular/Crystalline; Specific Gravity: Approx. 2.6-3.0
- Hardness
- 6-7 Mohs
- Color
- Light grey to white matrix with brassy metallic flecks
- Luster
- Vitreous to metallic
Identified More metamorphic →
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Physical properties
Hardness: 6-7 Mohs; Color: Light grey to white matrix with brassy metallic flecks; Luster: Vitreous to metallic; Cleavage: None; Structure: Granular/Crystalline; Specific Gravity: Approx. 2.6-3.0
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. The pyrite inclusions typically form under hydrothermal conditions or within anaerobic sedimentary environments prior to metamorphism.
Uses & applications
Used primarily as decorative stone, construction aggregate, and as a specimen for educational or amateur collecting.
Geological facts
The metallic 'fool's gold' (pyrite) within this rock can oxidize over time when exposed to air and water, leading to rusty iron oxide staining on the surface of the specimen.
Field identification & locations
Identify by its extreme hardness (cannot be scratched by a steel knife) and the presence of small, brassy metallic crystals in a sugary, granular matrix. Found in mountainous regions with metamorphic belts.
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