metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
Hardness: 7 (Mohs scale); Color: White, tan, or yellowish due to iron oxides; Luster: Vitreous to dull (when weathered); Crystal Structure: Hexagonal (microcrystalline); Cleavage: None, conchoidal fracture; Specific Gravity: 2.6-2.7
- Hardness
- 7 (Mohs scale)
- Color
- White, tan, or yellowish due to iron oxides
- Luster
- Vitreous to dull (when weathered)
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Physical properties
Hardness: 7 (Mohs scale); Color: White, tan, or yellowish due to iron oxides; Luster: Vitreous to dull (when weathered); Crystal Structure: Hexagonal (microcrystalline); Cleavage: None, conchoidal fracture; Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz sandstone under intense heat and pressure. This specimen has been further shaped by fluvial or coastal erosion into a smooth, rounded beach pebble. Geological age ranges from Precambrian to Cenozoic depending on the source rock.
Uses & applications
Used in construction as a decorative stone, high-quality road ballast, and in the production of glass or silica-based ceramics. Smooth pebbles are popular for landscaping and home decor.
Geological facts
Quartzite is so hard and chemically resistant that it often remains as jagged peaks or durable pebbles long after surrounding rocks have eroded away. It is harder than a steel knife and will easily scratch glass.
Field identification & locations
Identify in the field by its hardness (it should scratch glass) and its sugary, granular texture when viewed closely. Common in riverbeds, glacial tills, and coastal beach deposits. Collectors look for unique banding or internal veining.
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