mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Translucent white to tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Translucent white to tan
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Translucent white to tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.
Formation & geological history
Formed via igneous or hydrothermal processes, then eroded and rounded by water action in a river or beach environment. Standard quartz is found in all geological ages.
Uses & applications
Industrial uses include glassmaking, abrasives, and electronics. Small polished pebbles are used in landscaping, aquariums, and home decor.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Over time, physical weathering turns larger quartz veins into rounded river stones like this one.
Field identification & locations
Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Common in riverbeds, glacial tills, and beaches worldwide.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
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Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous