mineral
Chalcedony on Matrix
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale; Color: waxy translucent white to tan on white opaque matrix; Luster: waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Cleavage: none; Fracture: conchoidal.
- Hardness
- 6
- Color
- waxy translucent white to tan on white opaque matrix
- Luster
- waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: waxy translucent white to tan on white opaque matrix; Luster: waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Cleavage: none; Fracture: conchoidal.
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic cavities, sedimentary basins, or as replacement material. Typically found in Cenozoic era formations.
Uses & applications
Used in gemstone carvings, jewelry (cabochons), and for healing crystals or as a decorative collector specimen.
Geological facts
Chalcedony is a cryptocrystalline form of silica, meaning its crystals are so small they can only be seen under extreme magnification. Agate and Jasper are both varieties of chalcedony.
Field identification & locations
Identify by its waxy luster and the way it often forms botryoidal (grape-like) or smooth coatings over a host rock. Commonly found in desert environments like Arizona or Oregon.
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