sedimentary

Quartz Pebble (Quartzite Pebble)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

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

Identified July 25, 2026More sedimentary →

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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.