metamorphic
Quartzite with Iron Inclusions
Metamorphosed Quartz-Rich Sandstone (SiO2 with Fe2O3)
Hardness: 7 on Mohs scale; Color: Reddish-brown to tan with translucent white patches; Luster: Vitreous to dull; Structure: Granoblastic (sugary texture); Cleavage: None; SG: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Reddish-brown to tan with translucent white patches
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Reddish-brown to tan with translucent white patches; Luster: Vitreous to dull; Structure: Granoblastic (sugary texture); Cleavage: None; SG: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, likely during the Proterozoic or Paleozoic eras. The red coloration is due to iron oxide (hematite) staining.
Uses & applications
Used in construction as crushed stone, road ballast, and decorative landscaping. High-quality specimens are used as architectural stone or in lapidary work.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, often forming the peaks of hills and ridges. It is harder and more durable than the sandstone from which it originated.
Field identification & locations
Identify by its ability to scratch glass and its grainy, crystalline appearance. It lacks the 'fizz' reaction to acid that marble (a similar-looking rock) would have. Commonly found in glaciated regions or mountain belts.
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