mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: cloudy white to translucent tan, Luster: vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: poor (conchoidal fracture)
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Physical properties
Hardness: 7 (Mohs scale), Color: cloudy white to translucent tan, Luster: vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: poor (conchoidal fracture)
Formation & geological history
Formed through hydrothermal processes in veins or as a major constituent of igneous rocks; later weathered and water-worn into a pebble shape via fluvial or coastal erosion.
Uses & applications
Used in glassmaking, abrasives, construction aggregates, and as decorative gravel; minor uses in low-cost river stone jewelry.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Commonly identified by its ability to scratch glass and lack of cleavage. Found in riverbeds, beaches, and soil worldwide. It is a fundamental marker for quartz-rich geological environments.
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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