sedimentary
Quartz Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide)
Hardness: 7 on Mohs scale; Color: Milky white to off-white; Luster: Dull to vitreous in fresh fractures; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Color
- Milky white to off-white
- Luster
- Dull to vitreous in fresh fractures
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to off-white; Luster: Dull to vitreous in fresh fractures; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: ~2.65.
Formation & geological history
Formed through the erosion and water-smoothing of quartz veins or quartzite rock over extended periods in riverbeds, lakes, or coastal beach environments.
Uses & applications
Commonly used as decorative landscaping pebbles, aggregate in construction, or for lapidary and rock tumbling hobbies.
Geological facts
Smooth white quartz pebbles are among the most common water-worn pebbles found globally. Small natural indentations or pits often contain micro-crystals of quartz or agate inclusions.
Field identification & locations
Can be identified by its white chalky/milky appearance, hardness (scratches glass), and water-rounded shape. Easily collected along beaches, riverbanks, and gravel pits worldwide.
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