Global Gemology - Rare Gems & Jewels
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FIRE AGATE

Picture
Fire agate
Photo courtesy of ATG Gems
Variety:  Fire Agate
Species:  Chalcedony

​​Mohs Hardness:  7.0 out of 10
Color:  Iridescent colors against a dark reddish brown bodycolor.
RI:  1.535 to 1.539 (1.53 to 1.54 spot reading)
Birefringence:  Not detectable
SR/DR/AGG:  AGG
Spectrum:  Not diagnostic
Fluorescence:  Generally inert
SG:  2.60 (+0.10/-0.05)

Fire Agate Facts

Picture
Fire agate
Photo courtesy of ATG Gems

Fire agate is a phenomenal variety of chalcedony that displays iridescence.

It's often fashioned into freeform pieces to show off its iridescent, botryoidal structure that resembles a bushel of grapes.
  • HOME
  • ABOUT
  • SHOP
  • SERVICES
    • APPRAISALS
    • EXPERT WITNESS TESTIMONY
    • SELL YOUR JEWELRY
  • GEMOLOGY
    • GEM ENCYCLOPEDIA
    • THE ART OF GEMOLOGY
  • JEWELRY EDUCATION
    • DIAMOND FACTS
    • JEWELER DIRECTORY
    • JEWELRY PERIODS
    • POCKET WATCHES
    • NATIVE AMERICAN JEWELRY
  • GLOSSARY