metamorphic
Quartzite Pebbles
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: white, grey, tan, pinkish; Luster: vitreous to dull; Crystal structure: hexagonal (microcrystalline/interlocking); Cleavage: none (conchoidal fracture); Specific gravity: 2.63 - 2.65.
- Hardness
- 7 on Mohs scale
- Color
- white, grey, tan, pinkish
- Luster
- vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: white, grey, tan, pinkish; Luster: vitreous to dull; Crystal structure: hexagonal (microcrystalline/interlocking); Cleavage: none (conchoidal fracture); Specific gravity: 2.63 - 2.65.
Formation & geological history
Formed through the metamorphism of quartz sandstone under high heat and pressure, often during mountain-building events. These specific specimens are water-worn river or beach pebbles smoothed by erosion.
Uses & applications
Used in construction as road ballast, in glass manufacturing if pure, and as decorative pebbles in landscaping or craft projects.
Geological facts
Quartzite is so tough that it often outlasts the surrounding mountains, remaining as durable pebbles in riverbeds for millions of years. It is harder than steel and will scratch a glass plate easily.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a steel blade) and its granular, sugary appearance when broken. These are common in river basins and glacial deposits globally.
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