Mohs Hardness: 5 to 6 out of 10
Color: Banded variety of chalcedony that has sard or carnelian with alternating bands of white onyx, black onyx, or both.
RI: 1.535 to 1.539 (1.53 to 1.54 spot reading)
Birefringence: Usually not detectable
Spectrum: Not diagnostic
Fluorescence: Generally inert
SG: 2.60 (+0.10/-0.05)
Routine Treatments: None