metamorphic
Quartzite with Calcite Tufa
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
Hardness: 7 (quartzite) / 3 (calcite coating); Color: White to grey with tan/buff crust; Luster: Vitreous to dull; Structure: Granular/Massive; SG: 2.65
- Hardness
- 7 (quartzite) / 3 (calcite coating)
- Color
- White to grey with tan/buff crust
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (quartzite) / 3 (calcite coating); Color: White to grey with tan/buff crust; Luster: Vitreous to dull; Structure: Granular/Massive; SG: 2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, with subsequent surface deposition of calcium carbonate (calcite) from water minerals.
Uses & applications
Used in construction, as railroad ballast, for glass making, and as decorative landscape stones.
Geological facts
Quartzite is so tough it often breaks through the quartz grains rather than around them, making it one of the most durable rocks on Earth's surface.
Field identification & locations
Identify by a hardness test; the white interior will scratch glass, while the tan exterior crust will fizz when exposed to weak acid (vinegar). Found globally in mountainous regions.
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