metamorphic
Quartzite river stone
Quartzite (mostly SiO2)
Hardness: 7 on Mohs scale; Color: Creamy yellow to tan; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None/conchoidal fracture; Specific gravity: 2.6-2.65.
- Hardness
- 7 on Mohs scale
- Color
- Creamy yellow to tan
- Luster
- Vitreous to waxy
Identified More metamorphic →
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Physical properties
Hardness: 7 on Mohs scale; Color: Creamy yellow to tan; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None/conchoidal fracture; Specific gravity: 2.6-2.65.
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure, typically during tectonic mountain-building events. This piece has been naturally tumbled and smoothed by water action in a river or beach environment.
Uses & applications
Commonly used as decorative landscaping stone, in construction as crushed stone or ballast, and as a durable material for pathways or garden features. High-purity quartzite is used in glass and ceramic production.
Geological facts
Quartzite is one of the most physically and chemically resistant rocks found on Earth's surface. Small smooth river stones like this are often sold as 'worry stones' or used in pebble mosaics.
Field identification & locations
Identify in the field by its extreme hardness (it will easily scratch steel) and its grainy, sugary texture visible under a magnifier despite the smooth surface. It is ubiquitously found in riverbeds and glacial deposits.
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