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Answer: dumortierite
Answer	Crossword Clue
dumortierite	A rare blue or violet mineral occurring typically as needles and fibrous masses in gneiss and schist. It consists of an aluminum and iron borosilicate
dumortierite	(French) an orthorhombic borosilicate of aluminium occurring as small violet or blue needles or fibrous masses esp in gneisses and schists

Crossword

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

Answer: dumortierite