Answer:

iolite

Answer	Crossword Clue
IOLITE	Bluish mineral.
IOLITE	A blue mineral.
IOLITE	Blue mineral.

IOLITE	Blue or violet mineral.
IOLITE	Gem.
IOLITE	Blue mineral
IOLITE	Bluish crystalline mineral
IOLITE	Mineral

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.