Answer: quartz

AnswerCrossword Clue
QUARTZJasper or agate
quartzhard crystalline mineral
quartza mineral
QUARTZThe crystal in some crystal balls
QUARTZIt's 7 on the Mohs scale of hardness
QUARTZAmethyst, e.g.
QUARTZAmethyst or citrine
QUARTZWhat a crystal ball gazer sees
QUARTZTiger's-eye, essentially
QUARTZ7 on the Mohs scale
QUARTZHard rock
QUARTZSeven on the Mohs' scale
QUARTZBasis for some watches
QUARTZSand's main ingredient
QUARTZAmethyst or sandstone
QUARTZCrystalline mineral
QUARTZKind of crystal.
QUARTZMineral.
QUARTZForm of silica.
QUARTZSilica.
QUARTZAmethyst, rock crystal, etc.
QUARTZCrystal in some watches
QUARTZWatch-crystal mineral
QUARTZVibrating crystal
QUARTZCitrine or amethyst
QUARTZSilicon mineral
QUARTZOnyx or amethyst
QUARTZKind of watch
QUARTZJasper or onyx