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Thought by Theophrastus to be a form of permanent ice, a silicious piezoelectric mineral such as the purple amethyst, smoky-brown cairngorm or the yellow citrine

Let's find possible answers to "Thought by Theophrastus to be a form of permanent ice, a silicious piezoelectric mineral such as the purple amethyst, smoky-brown cairngorm or the yellow citrine" crossword clue. First of all, we will look for a few extra hints for this entry: Thought by Theophrastus to be a form of permanent ice, a silicious piezoelectric mineral such as the purple amethyst, smoky-brown cairngorm or the yellow citrine. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.