mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, vitreous to waxy luster, trigonal crystal system, white to milky opacity, no cleavage.
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Physical properties
Mohs hardness of 7, vitreous to waxy luster, trigonal crystal system, white to milky opacity, no cleavage.
Formation & geological history
Formed in hydrothermal veins or pegmatites; rounded and smoothed through alluvial tumbling in rivers or beach surf.
Uses & applications
Used in landscaping, decorative stone arrangements, lapidary tumbling, and as an abrasive or silica source.
Geological facts
The milky white appearance is caused by millions of microscopic fluid inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identified by its hardness (scratches glass and steel), lack of reaction to acid, and smooth water-worn surface.
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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
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
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