metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Tan, brown, white, and translucent gray; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Tan, brown, white, and translucent gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan, brown, white, and translucent gray; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, followed by river or glacial erosion into a rounded pebble shape. Geological age varies widely from Precambrian to Cenozoic.
Uses & applications
Primarily used as construction aggregate, railway ballast, and in the manufacturing of glass and ceramics. As a pebble, it is common in decorative landscaping.
Geological facts
Quartzite is so tough that it often breaks through the individual quartz grains rather than around them. It is one of the most durable rocks on Earth's surface.
Field identification & locations
Identify by its ability to scratch glass and lack of reaction to acid. Commonly found in riverbeds, beaches, and glacial till. Collectors value them as durable 'touchstones' or for tumbling.
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