mineral
Quartz / Chalcedony Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale; vitreous to waxy luster; trigonal crystal system; conchoidal fracture.
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Physical properties
Hardness 7 on Mohs scale; vitreous to waxy luster; trigonal crystal system; conchoidal fracture.
Formation & geological history
Formed through hydrothermal deposition or secondary precipitation in sedimentary or volcanic rock cavities.
Uses & applications
Used in lapidary arts, jewelry tumbling, and as abrasive or silica sources in industry.
Geological facts
Quartz is the second most abundant mineral in the continental crust and highly resistant to weathering.
Field identification & locations
Identified by its hardness (scratches glass), lack of cleavage, and durability; extremely common in river gravels globally.
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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
Unidentified pink-and-gray mineral or rock specimen
Undetermined; the image is too blurry for reliable identification
mineral