mineral
Chalcedony
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7. Displays a waxy to vitreous luster with translucent to opaque transparency and conchoidal fracture.
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Physical properties
Mohs hardness of 6.5 to 7. Displays a waxy to vitreous luster with translucent to opaque transparency and conchoidal fracture.
Formation & geological history
Forms in hydrothermal veins and cavities within volcanic and sedimentary rocks at low temperatures from silica-rich solutions.
Uses & applications
Widely used in ornamental carvings, jewelry, lapidary art, and historical stone tools.
Geological facts
Chalcedony is the cryptocrystalline form of quartz, serving as the parent material for varieties like agate, jasper, and onyx.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, and lack of visible crystal grains. Commonly found worldwide in volcanic rock cavities.
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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