metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Hardness: 7 on Mohs scale; Color: white to light gray; Luster: vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: none; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- white to light gray
- Luster
- vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: white to light gray; Luster: vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: none; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure from tectonic activity. This specific specimen has been further shaped by fluvial or marine erosion into a smooth pebble.
Uses & applications
Quartzite is used heavily in construction as road ballast, crushed stone for concrete, and decorative landscaping. High-purity quartzite is used to produce silica sand for glassmaking.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during weathering, remaining as rounded pebbles in riverbeds or forming the caps of resistant mountain ridges.
Field identification & locations
Identify by its ability to scratch glass and smooth, sugary texture on fresh breaks. Commonly found in riverbeds, beaches, and areas with ancient mountain belts.
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