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The Clue

Aluminous mineral (10 letter answer)

The Answer

HORNBLENDE

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Notes

The answer HORNBLENDE is so rare that it appears less than once every 2500 puzzles.

Related Clues

Amphibole

Definition

HORNBLENDE as a noun:

1. a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron