metamorphic
Quartzite with Mica Matrix
Metamorphic Quartz-Mica Schist/Quartzite
Hardness: 6.5-7 on Mohs scale (quartz component); Color: Grayish-brown matrix with light white-grayish quartz cap; Luster: Vitreous to dull; Structure: Fine-grained matrix with microcrystalline quartz; Specific Gravity: ~2.6-2.7.
- Hardness
- 6
- Color
- Grayish-brown matrix with light white-grayish quartz cap
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale (quartz component); Color: Grayish-brown matrix with light white-grayish quartz cap; Luster: Vitreous to dull; Structure: Fine-grained matrix with microcrystalline quartz; Specific Gravity: ~2.6-2.7.
Formation & geological history
Formed through regional metamorphism where quartz-rich sandstone or shale undergoes high heat and pressure, altering the mineral composition and compacting the structure into a durable metamorphic rock.
Uses & applications
Commonly used as construction aggregate, decorative stone, railway ballast, and landscaping gravel. Minor value for amateur mineral collectors.
Geological facts
Quartzite is extremely resistant to chemical weathering and erosion, often outlasting surrounding softer rocks and creating ridge tops or outcrop summits.
Field identification & locations
Identified in the field by its hardness (scratches glass) and granular texture where individual quartz grains do not easily detach. Found globally in ancient mountain belts and metamorphic rock terrains.
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