Answer: QUARTZ

Possible questions:


Crystalline mineral we know 3 Answers
Hard rock we know 4 Answers
Amethyst, e.g. we know 2 Answers
Jasper or agate we know 2 Answers
Watch crystal, maybe we know 1 Answer
Tiger's-eye, essentially we know 1 Answer
Silicon mineral we know 1 Answer
Seven on the Mohs' scale we know 1 Answer
Sand's main ingredient we know 1 Answer
Sand ingredient we know 1 Answer
Onyx or amethyst we know 1 Answer
Hard mineral we know 1 Answer
Crystal in some watches we know 1 Answer
Basis for some watches we know 1 Answer
Amethyst or sandstone we know 1 Answer
Amethyst or citrine we know 1 Answer
7 on the Mohs scale we know 1 Answer

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