Quartz, though, is at least a partial exception to this rule. ... like flint. Chemically, quartz is nearly pure silicon dioxide (SiO 2). When there are no impurities, ...

It’s important to note that the “flint rock” you find is unlikely to be actual flint or a rock — it’ll probably be some other hard mineral, such as quartz, chert, or agate.

We have now found means whereby the melting-quality quartz can be replaced satisfactorily by other mineral substances rich in silica, such as flint and quartzite.

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