metamorphic
Quartzite (Tumbled)
Metamorphic Quartzite (SiO2)
Hardness: 7 (Mohs scale); Color: Pinkish-brown to tan; Luster: Vitreous to waxy (when tumbled); Structure: Granular/Massive; SG: 2.6 - 2.7
- Hardness
- 7 (Mohs scale)
- Color
- Pinkish-brown to tan
- Luster
- Vitreous to waxy (when tumbled)
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Physical properties
Hardness: 7 (Mohs scale); Color: Pinkish-brown to tan; Luster: Vitreous to waxy (when tumbled); Structure: Granular/Massive; SG: 2.6 - 2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically in convergent plate boundaries. The pink/brown hue is caused by iron oxide (hematite) inclusions.
Uses & applications
Commonly used as decorative stones, in landscaping, as aggregate in construction, and occasionally for lapidary work or as pocket stones.
Geological facts
Quartzite is so tough that it often survives intense erosion long after the rocks around it have worn away, forming ridges and mountain peaks.
Field identification & locations
Identify by its ability to scratch glass and lack of reaction to acid. Look for a sugary texture on broken surfaces. Found worldwide in ancient mountain belts.
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