Enter a clue or pattern or both:
The Clue
An October birthstone (10 letter answer)
The Answer
TOURMALINE
Tags
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