mineral
Carnelian or Red Agate
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, typically displays orange, red, or brownish-red colors with a waxy luster. It has a cryptocrystalline structure and no cleavage.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, typically displays orange, red, or brownish-red colors with a waxy luster. It has a cryptocrystalline structure and no cleavage.
Formation & geological history
Forms primarily as silica-rich water percolates through cavities in volcanic or sedimentary rocks, often colored by iron oxide impurities.
Uses & applications
Widely used in jewelry, cabochons, and ornamental carvings. Historically popular for intaglios and seals.
Geological facts
Carnelian has been used for millennia, notably in ancient Egyptian artifacts and Roman signet rings.
Field identification & locations
Identified by its red-orange color, translucency when backlit, and waxy luster. Common in Brazil, India, and Madagascar.
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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
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