mineral
Carnelian (Chalcedony Pebble)
Silicon Dioxide (SiO2 with iron impurities)
AI-generated identification · may be incorrectHardness 6.5-7 on the Mohs scale, waxy to vitreous luster, translucent to semi-opaque reddish-orange to peach color, trigonal microcrystalline structure.
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Physical properties
Hardness 6.5-7 on the Mohs scale, waxy to vitreous luster, translucent to semi-opaque reddish-orange to peach color, trigonal microcrystalline structure.
Formation & geological history
Formed as low-temperature silica precipitates within cavities or veins of volcanic host rocks, frequently smoothed into rounded pebbles by stream or wave action.
Uses & applications
Commonly used in lapidary arts, tumbled stones, beads, carved cabochons, and ornamental jewelry.
Geological facts
Carnelian has been mined and utilized since the Neolithic period, notably in ancient Egyptian and Roman signet rings and amulets.
Field identification & locations
Identifiable by its warm orange-red hue, lack of cleavage, conchoidal fracture, and waxy luster; found in gravel beds, river shores, and volcanic areas worldwide.
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Sandstone (with potential mineral staining/concretions)
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Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
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