mineral
Purple Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.64.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.64.
Formation & geological history
Formed in low-temperature hydrothermal environments or as deposits from silica-rich solutions filling cavities in host rocks, often associated with volcanic activity.
Uses & applications
Used in gemstone carving, lapidary arts, decorative items, and mineral collecting.
Geological facts
Chalcedony has been used for thousands of years by various ancient civilizations to create intaglios, seals, and ornamental jewelry.
Field identification & locations
Identified by its waxy luster, microcrystalline nature, and characteristic purple color variations. Found worldwide in volcanic and sedimentary 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
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary