mineral
Milky quartz pebble
Quartz (SiO₂)
AI-generated identification · may be incorrectMostly opaque white to cream, with a dull, weathered surface; quartz has hardness 7, vitreous luster on fresh surfaces, and a hexagonal crystal structure. The specimen’s exact identity cannot be confirmed from appearance alone.
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Physical properties
Mostly opaque white to cream, with a dull, weathered surface; quartz has hardness 7, vitreous luster on fresh surfaces, and a hexagonal crystal structure. The specimen’s exact identity cannot be confirmed from appearance alone.
Formation & geological history
Likely a naturally weathered quartz fragment, formed as silica crystallized from cooling magma or mineral-rich fluids; quartz occurs in rocks of many geological ages and settings.
Uses & applications
Quartz is widely used in glass, electronics, construction, and jewelry; this rough, common piece is mainly suitable for collecting or craft use.
Geological facts
Quartz is one of Earth’s most abundant minerals and resists weathering, so it commonly survives as rounded pebbles.
Field identification & locations
Look for hardness greater than glass and no cleavage; quartz breaks with irregular or curved fractures. Common worldwide in veins, granites, and stream gravels.
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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