mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky to translucent tan; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- Milky to translucent tan
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky to translucent tan; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture).
Formation & geological history
Forms through hydrothermal activity or crystallization from magma, later eroded and rounded by water action in riverbeds or coastal environments. Often millions of years old.
Uses & applications
Used as an abrasive, in glassmaking, as decorative landscaping stone, and occasionally in inexpensive jewelry after tumbling.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. These rounded shapes indicate transport by water over long periods.
Field identification & locations
Identify by its ability to scratch glass and lack of cleavage. Look for smooth, water-worn surfaces in creek beds or shorelines.
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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
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral