What is another word for quartz?

There isn't really a true synonym for "quartz" as it's a specific type of mineral. However, depending on the context, you could use other words that capture different aspects of quartz:

Similar minerals:

* Silica: This is the chemical composition of quartz (silicon dioxide).

* Crystalline silica: This is a more specific term for the crystalline form of silica, which quartz is.

* Rock crystal: This refers to a clear, colorless variety of quartz.

Other options:

* Crystal: This is a general term for any mineral that forms a regular, repeating structure.

* Gemstone: Some varieties of quartz are used as gemstones, like amethyst and citrine.

* Silicon dioxide: This is the chemical formula of quartz.

The best word to use will depend on the specific situation and what you want to emphasize.