metamorphic
Quartzite with Mafic Intrusion (Gneiss/Schist Contact)
Metamorphic Quartzite (SiO2) with Amphibole/Biotite Schist
Hardness: 7 (quartz section). Color: Milky white and dark charcoal grey. Luster: Vitreous to dull. Crystal structure: Granular metamorphic. Specific gravity: ~2.65-3.0.
- Hardness
- 7 (quartz section)
- Color
- Milky white and dark charcoal grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (quartz section). Color: Milky white and dark charcoal grey. Luster: Vitreous to dull. Crystal structure: Granular metamorphic. Specific gravity: ~2.65-3.0.
Formation & geological history
Formed through regional metamorphism where sandstone (quartzite precursor) and igneous or clay-rich rock (dark precursor) were subjected to intense heat and pressure deep within the Earth's crust, often during mountain-building events.
Uses & applications
Primarily used as decorative landscape stone or as an educational geological specimen; quartz components are used in glass and electronics industries.
Geological facts
The sharp line between the white and dark sections represent a 'contact' zone, showing where two different types of rock fused together during metamorphic processes millions of years ago.
Field identification & locations
Identified by the inability for a steel knife to scratch the white portion (quartz) and the distinct color banding. Commonly found in glacial till or riverbeds in regions with ancient mountain roots.
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