JDMISGem Reference
Al2SiO5 polymorphs (with andalusite and sillimanite) · Kyanite

Kyanite

Kyanite — Kyanite

Kyanite offers sapphire-like blue with a twist: one crystal, two hardnesses, and perfect cleavage. The finest Nepalese gems are lovely and collectable; all kyanite needs protective settings and patient cutters.

Colour
blue
Transparency
Transparent to translucent
RI
1.716–1.731
SG
3.55–3.68
Mohs
4.0–7.5
Birthstone
December · February
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