metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: White to light grey; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Specific gravity: 2.6-2.7. Extremely durable and chemical resistant.
- Hardness
- 7 on Mohs scale
- Color
- White to light grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: White to light grey; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Specific gravity: 2.6-2.7. Extremely durable and chemical resistant.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. Under intense heat and pressure, the sand grains recrystallize and fuse together. This specific specimen has been further shaped into a smooth pebble by fluvial or marine abrasion.
Uses & applications
Used in construction as road ballast, in glass manufacturing, for flooring and wall coverings, and commonly as decorative landscaping stone.
Geological facts
Quartzite is so hard and dense that when fractured, the break passes through the sand grains rather than around them. It is one of the most physically resistant rocks found on Earth's surface.
Field identification & locations
Identify in the field by its hardness (will scratch glass and steel) and lack of reaction to acid. Commonly found in riverbeds, beaches, and ancient mountain belts. Look for a sugary texture on fresh breaks.
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