mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on the Mohs scale. Color: Typically white, clear, grey, or yellowish. Luster: Vitreous (glassy). Crystal Structure: Trigonal. Cleavage: None (exhibits conchoidal fracture). Specific Gravity: 2.65.
- Hardness
- 7 on the Mohs scale
- Color
- Typically white, clear, grey, or yellowish
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on the Mohs scale. Color: Typically white, clear, grey, or yellowish. Luster: Vitreous (glassy). Crystal Structure: Trigonal. Cleavage: None (exhibits conchoidal fracture). Specific Gravity: 2.65.
Formation & geological history
Formed through crystallization from magma or silica-rich solutions in hydrothermal veins, and subsequently weathered and transported by water into a rounded pebble.
Uses & applications
Used in decorative landscaping, glass manufacturing, abrasives, electronics, and lapidary work.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust and is exceptionally resistant to weathering, which is why it often survives as a pebble long after other minerals have eroded away.
Field identification & locations
Can be identified by its high hardness (scratches glass) and conchoidal fracture. Found worldwide in riverbeds, beaches, and sedimentary deposits.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary