sedimentary
Quartz Pebble (Quartzite Pebble)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Off-white to pale cream/gray. Luster: Dull to vitreous when wet or polished. Crystal structure: Trigonal (microcrystalline/massive). Specific gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Color
- Off-white to pale cream/gray
- Luster
- Dull to vitreous when wet or polished
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Physical properties
Hardness: 7 on Mohs scale. Color: Off-white to pale cream/gray. Luster: Dull to vitreous when wet or polished. Crystal structure: Trigonal (microcrystalline/massive). Specific gravity: ~2.65.
Formation & geological history
Formed as water-worn pebbles transported by river networks or glacial activity. Many found in the West Midlands/Shropshire region originate from Carboniferous conglomerates or Triassic Pebble Beds (Sherwood Sandstone Group).
Uses & applications
Commonly used in landscaping, gravel aggregates, aquariums, and rock tumbling/crafts.
Geological facts
Smooth pebbles like this were reshaped and rounded over millions of years by high-energy river currents or beach action before being preserved in ancient sandstone beds.
Field identification & locations
Identified by its high hardness (scratches glass/steel easily), light off-white color, rounded water-worn shape, and lack of reaction to dilute acids. Extremely common in glacial tills and Triassic gravels across the UK Midlands.
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