metamorphic
Red Quartzite
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Reddish-purple to pink; Luster: Vitreous to dull; Crystal structure: Trigonal (granular texture); Specific gravity: 2.6-2.7. Non-foliated metamorphosed sandstone.
- Hardness
- 7 on Mohs scale
- Color
- Reddish-purple to pink
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Reddish-purple to pink; Luster: Vitreous to dull; Crystal structure: Trigonal (granular texture); Specific gravity: 2.6-2.7. Non-foliated metamorphosed sandstone.
Formation & geological history
Formed when quartz-rich sandstone is subjected to high heat and pressure, causing the quartz grains to recrystallize. The red color suggests the presence of iron oxide (hematite) during formation. Usually Proterozoic or Paleozoic in age.
Uses & applications
Used as decorative stone in landscaping, aggregate in road construction, and sometimes as a polishing media. Fine specimens are used for stone carving and as garden features.
Geological facts
Quartzite is one of the most durable rocks on Earth's surface. It is often so tough that when it breaks, the fracture passes through the quartz grains rather than along their boundaries.
Field identification & locations
Identify by its extreme hardness (can scratch glass) and granular, 'sugary' texture. Commonly found in glaciated riverbeds or coastal areas as rounded cobbles.
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