Rock Identifier
Carnelian Ring (SiO2 (Variety of Chalcedony)) — gemstone
gemstone

Carnelian Ring

SiO2 (Variety of Chalcedony)

Hardness of 6.5 to 7 on the Mohs scale, reddish-orange to brown color, vitreous to waxy luster, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture with no cleavage, and a specific gravity around 2.60 to 2.65.

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, reddish-orange to brown color, vitreous to waxy luster, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture with no cleavage, and a specific gravity around 2.60 to 2.65.

Formation & geological history

Forms in low-temperature hydrothermal environments, cavities of volcanic rocks, and sedimentary strata by the deposition of silica from groundwater rich in iron oxide impurities.

Uses & applications

Extensively used in fine jewelry, rings, talismans, signet rings, carvings, and ornamental lapidary work.

Geological facts

Carnelian has been prized since ancient times, frequently used in ancient Egypt as amulets for the afterlife and in Roman times for wax seal rings because hot wax does not stick to it.

Field identification & locations

Easily identified by its translucent reddish-orange hue and waxy luster; commonly sourced from India, Brazil, Uruguay, and Madagascar.

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