What does the word crystal mean?

Usage examples for crystal

  1. Near the base of this cliff flowed a clear crystal spring. – Where Strongest Tide Winds Blew by Robert McReynolds
  2. Once it was my own mind that saw a problem as clear as crystal. – The Long Lane's Turning by Hallie Erminie Rives
  3. " It's no trouble; I'll look a little longer; we'll not give it up so soon," said Jem; and after he had looked a little longer, he found the piece of crystal. – The Parent's Assistant by Maria Edgeworth