Other crossword clues for answer "QUARTZ"QUARTZCrystalline mineralMakeup of some gems and wristwatchesJasper or onyxKind of watchOnyx or amethystSilicon mineralCitrine or amethystVibrating crystalWatch-crystal mineralCrystal in some watchesAmethyst, rock crystal, etc.Silica.Form of silica.Mineral.Kind of crystal.Jasper or agateAmethyst or sandstoneSand's main ingredientBasis for some watchesSeven on the Mohs' scaleHard rock7 on the Mohs scaleTiger's-eye, essentiallyWhat a crystal ball gazer seesAmethyst or citrineThe crystal in some crystal ballsIt has milky and smoky varietiesAmethyst is a purple form of itAmethyst, e.g.It's 7 on the Mohs scale of hardness