Ammolite
Location not listed · Listed 23/Aug/2026
Specimen facts
- Kind
- gem
- Formula
- CaCO₃ with impurities
- Hardness
- 3.5–4
- Luster
- Vitreous
- Colors
- Red, green, blue, yellow, violet
- Typical market
- $20–$80 / ct · typical specimen
Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains. It is made from the fossilized shells of ammonites.
Look for iridescent colors and the spiral shape of ammonite fossils.
Collector
arslannasimjee
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