mineral
Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline structure, and white to gray streak.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline structure, and white to gray streak.
Formation & geological history
Forms in low-temperature hydrothermal environments and by deposition from silica-rich groundwater within cavities of rocks.
Uses & applications
Used in ornamental carvings, jewelry, lapidary art, and historical stone tools.
Geological facts
Chalcedony is the cryptocrystalline form of silica, comprising distinct varieties like jasper, agate, and onyx.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, and microcrystalline texture. Found globally in volcanic and sedimentary rocks.
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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