Answer: iolite

AnswerCrossword Clue
IOLITEBluish mineral.
IOLITEA blue mineral.
IOLITEBlue mineral.
IOLITEBlue or violet mineral.
IOLITEGem.
IOLITEBlue mineral
IOLITEBluish crystalline mineral
IOLITEMineral
iolitestrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks