Ammolite
gem · uncommon
Quick facts
- Formula
- CaCO₃ with impurities
- Hardness
- 3.5–4
- Luster
- Vitreous
- Colors
- Red, green, blue, yellow, violet
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.
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Photograph your specimen on arockid.com or in RockSnap / RockID. Three free IDs a day — no card.
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