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Answer:
QUARTZ
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Crystalline mineral
Hard rock
Amethyst, e.g.
Jasper or agate
What a crystal ball gazer sees
Watch crystal, maybe
Tiger's-eye, essentially
Silicon mineral
Seven on the Mohs' scale
Sand's main ingredient
Sand ingredient
Onyx or amethyst
Makeup of some gems and wristwatches
It's 7 on the Mohs scale of hardness
Hard mineral
Crystal in some watches
Basis for some watches
Amethyst or sandstone
Amethyst or citrine
7 on the Mohs scale