Enter a clue or pattern or both:
The Clue
A source of aluminum (7 letter answer)
The Answer
ZEOLITE
Tags
Notes
The answer ZEOLITE is so rare that it appears less than once every 2500 puzzles.
Definition
ZEOLITE as a noun:
1. any of a family of glassy minerals analogous to feldspar containing hydrated aluminum silicates of calcium or sodium or potassium; formed in cavities in lava flows and in plutonic rocks