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Different learning resources categorise quartz differently. Strictly speaking, is quartz a silicate mineral or an oxide mineral?

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Quartz is a silicate at the most used Dana and Strunz classifications of minerals.

Several websites and mineralogists classify it as silicate.

The structure of quartz is similar to other silicates with Si-O tetrahedres.

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Quartz structure. quartzpage.de

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quartz a silicate mineral or an oxide mineral

Both. The two are not mutually exclusive.

Quartz is an oxide, because it is an oxide of the element silicon.

Quartz is also a silicate, because it is composed of a framework of silicate tetrahedra.

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