mineral
Carnelian
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, orange to reddish-brown color, waxy to vitreous luster, cryptocrystalline structure, no cleavage.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, orange to reddish-brown color, waxy to vitreous luster, cryptocrystalline structure, no cleavage.
Formation & geological history
Forms in low-temperature hydrothermal veins and as secondary deposits in volcanic rocks, typically over millions of years.
Uses & applications
Commonly used in jewelry, particularly for beads, cabochons, and carved intaglios; historically used for seals and amulets.
Geological facts
Carnelian was widely used by the ancient Egyptians for amulets and jewelry, believing it had protective and healing properties.
Field identification & locations
Identify by its orange-red color, waxy luster, and high hardness; commonly found 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