mineral
Carnelian
Chalcedony (SiO2)
AI-generated identification · may be incorrectMohs hardness 6.5-7, orange-red to brownish-red color, vitreous to waxy luster, microcrystalline quartz structure.
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Physical properties
Mohs hardness 6.5-7, orange-red to brownish-red color, vitreous to waxy luster, microcrystalline quartz structure.
Formation & geological history
Forms from the deposition of silica in low-temperature hydrothermal environments or as a secondary mineral in volcanic rocks.
Uses & applications
Historically used for seals, signet rings, amulets, and beads due to its hardness and uniform color. Still popular in lapidary work.
Geological facts
This specimen features intricate intaglio carving, likely an Islamic or Near Eastern seal, demonstrating its historical use as a medium for engraving.
Field identification & locations
Identified by its distinctive orange-red color and waxy luster. Common globally, notably in India, Brazil, and Uruguay.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
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