mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Off-white, greyish, tan. Luster: Dull to vitreous (glassy). Crystal Structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Off-white, greyish, tan
- Luster
- Dull to vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale. Color: Off-white, greyish, tan. Luster: Dull to vitreous (glassy). Crystal Structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.
Formation & geological history
Formed through igneous activity or hydrothermal veins, subsequently weathered, eroded, and rounded by water transport in rivers or ocean shores over thousands to millions of years.
Uses & applications
Commonly used in construction aggregate, landscaping, aquariums, glass manufacturing, and as a base material for silicon production.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Rounded quartz pebbles are often key components of sedimentary rocks like conglomerate.
Field identification & locations
Identified by its hardness (can scratch glass), lack of cleavage, and smooth water-worn surface. Found in riverbeds, beaches, glacial deposits, and gravel pits worldwide.
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Gypsum (variety Selenite or Alabaster)
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Mineral