mineral
Quartz (Chalcedony Fragment)
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 Mohs; translucent milky-white to pale tan; vitreous to waxy luster; trigonal crystal system with prominent conchoidal fracture.
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Physical properties
Hardness 7 Mohs; translucent milky-white to pale tan; vitreous to waxy luster; trigonal crystal system with prominent conchoidal fracture.
Formation & geological history
Precipitated from low-temperature silica-rich hydrothermal fluids or groundwater in volcanic or sedimentary host rocks.
Uses & applications
Commonly used in lapidary arts, jewelry, abrasives, and as collectible micro-specimens.
Geological facts
The concentric curved ripples visible on its surface are classic textbook examples of conchoidal fracture, typical of silica minerals.
Field identification & locations
Identified by high hardness (scratches glass), lack of cleavage, and sharp shell-like fracture planes; universally abundant worldwide.
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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
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous