Enter a clue or pattern or both:

The Clue

An October birthstone (10 letter answer)

The Answer

TOURMALINE

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Notes

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

Definition

TOURMALINE as a noun:

1. a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones