Iolite Characteristic Physical Properties
2.56-2.66 Range:+/-0.05 Typical:2.61
Iolite is a type II clarity stone. Sometimes apatite, hematite, iron oxide, magnetite, mica and rutile, inclusions are seen. Bloodshot iolite is the adventuresent variety with red plate like hematite, iron oxide inclusions along with goethite.
Good, in one direction, Poor, in two directions