mineral
Quartz Pebble (Chalcedony / Milky Quartz)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale; waxy to vitreous luster; translucent pale yellowish-white color; no cleavage with conchoidal fracture.
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Physical properties
Hardness 7 on Mohs scale; waxy to vitreous luster; translucent pale yellowish-white color; no cleavage with conchoidal fracture.
Formation & geological history
Precipitates from silica-rich hydrothermal fluids or weathers out from igneous/metamorphic host rocks, later rounded by alluvial or marine action.
Uses & applications
Commonly used for lapidary tumbling, ornamental gravel, abrasives, and raw material in glassmaking and electronics.
Geological facts
Quartz is one of the most abundant and weather-resistant minerals on Earth's continental crust, surviving extensive fluvial transport.
Field identification & locations
Identified in the field by its ability to scratch glass (Mohs 7), lack of cleavage, and smooth water-worn texture; abundant in riverbeds, beaches, and gravel 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