Below you can find the This gemstone that comes in fire & black varieties is itself a variety of the mineral cristobalite Jeopardy Words Answer. The answer to This gemstone that comes in fire & black varieties is itself a variety of the mineral cristobalite has 4 letters. This clue belongs to the Gems & jewelry category and is part of Jeopardy Word Level 1834. If you scroll near the bottom you will find other clues and answers part of level 1834