Fossil (ammonoid shell; gem layer is ammolite) · Ammonite

Ammonite (Ammolite)

Ammolite is the iridescent aragonite layer of Alberta's fossil ammonites - red-green fire in tessellated patches, mostly sold as stabilised doublets and triplets, and Alberta's official gemstone.

Colour
blue

Transparency
Opaque

RI
1.520–1.680

SG
2.60–2.85

Mohs
3.5–4.5

🔒 Full JDMIS reference record

Sign in to unlock price ranges by tier, common misidentifications, diagnostic inclusions, treatments, spectra, trade names and sources — free with the GT200 Gem Identification course.

GT200 Gem Identification ↗ Sign in

Browse the free gem reference · Test your eye — the Great Gem Quiz · Singapore gem testing labs

Ammonite (Ammolite)

Related gems