mineral
Quartz River Pebble
Crystalline Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Tan to milky white; Luster: Waxy to vitreous; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Tan to milky white
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan to milky white; Luster: Waxy to vitreous; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed through hydrothermal processes or within igneous rocks, then weathered out and smoothed over thousands of years by water transport in rivers or oceans.
Uses & applications
Used as decorative landscaping stone, in aggregate for construction, and as a raw material for glass making and silica sand.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. These rounded shapes are the result of constant abrasion against other rocks in high-energy water environments.
Field identification & locations
Identified by its hardness (cannot be scratched by steel) and lack of cleavage. Found in riverbeds, beaches, and glacial deposits 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
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous