Quartz, though, is at least a partial exception to this rule. Once its unusual electrical properties were understood, crystalline quartz was sent directly from quarries and mines to factories ...

the quartzite is treated (see below) to create polycrystalline silicon (polysilicon), a very pure silicon with multiple single-crystal regions of different sizes and orientations. The polysilicon ...

Quartz and quartzite countertops look similar, but they're both manufactured in different ways with different durability, ...

A slice of quartz ground to a prescribed thickness that vibrates at a steady frequency when stimulated by electricity. The tiny crystal, about 1/20th by 1/5th of an inch, creates the computer's ...