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Lentoid seal
MFA# 1971.173


A pale orange-red to deep red translucent stone that is a variety of Chalcedony. Carnelian was mined or gathered as an ornamental stone since at least 3000 BCE. It is found in Egypt, India and areas of Europe as water-worn pebbles. Carnelian was popular for amulets and scarabs and is still used as gemstones.

Carnelian amulets
MFA# 35.1500

Synonyms and Related Terms

sard; cornelian; chalcedony; Karneol (Deut., Pol.); cornaline (Fr.); cornalina (Esp., Port.)

Physical and Chemical Properties

Trigonal crystal system Fracture = conchoidal. Luster = vitreous to waxy. Streak = white.

Composition SiO2
Mohs Hardness 7.0
Density 2.6
Carnelian cabochon


Properties of Common Gemstones

Resources and Citations

  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979