mineral
Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7. Displays a waxy to vitreous luster with botryoidal habits and variable colors including brownish-red and green. Cryptocrystalline crystal structure with no cleavage.
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Physical properties
Mohs hardness of 6.5 to 7. Displays a waxy to vitreous luster with botryoidal habits and variable colors including brownish-red and green. Cryptocrystalline crystal structure with no cleavage.
Formation & geological history
Forms in low-temperature hydrothermal environments and cavities of volcanic rocks through the deposition of silica-rich groundwater over millions of years.
Uses & applications
Widely used for ornamental carvings, lapidary art, gemstone jewelry, and sought after by mineral collectors.
Geological facts
Botryoidal chalcedony often forms grape-like clusters with smooth, rounded surfaces created by surface tension during rapid precipitation.
Field identification & locations
Identified by its distinctive bulbous, bubble-like botryoidal texture and high hardness scratching glass. Commonly found worldwide in volcanic 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