Gemstone | Crystal System | Density | Hardness | Refractive index | Treatments |
Carnelian | microcrystalline | 2.65 | 7.0 | 1.535-1.539 | dying, filling |
Clarity: Semi-transparent
to translucent
Optic Character: AGG Cause of Color: Fe Fluorescence: Inert Fracture : Concoidal, sometimes granular Luster : Vitreous to greasy Cleavage : None Durability: Good Characteristics
for Identification:
AGG, SG, fracture luster Locality: |
|
Quartz
Family: |
Microcrystalline |

Carnelian intaglio Ptolemaic queen, carved 1st Century BC and set in a granulated archaelogical revival mounting circa 1724. Photo courtesy of Marie-Lan Nguyen.