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Hard cryptocrystalline variety of quartz commonly occurring as nodules in deposits of chalk and limestone

Let's find possible answers to "Hard cryptocrystalline variety of quartz commonly occurring as nodules in deposits of chalk and limestone" crossword clue. First of all, we will look for a few extra hints for this entry: Hard cryptocrystalline variety of quartz commonly occurring as nodules in deposits of chalk and limestone. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.