Color isn´t the best diagnostic tool for some common minerals, but it´s great for others. Color can vary due to impurities in the mineral - for example, quartz can be clear, milky, pink (rose quartz), grey (smoky quartz), yellow (citrine), or purple (amethyst). But while you can´t rely solely on color to identify a mineral, it does help. A clear mineral won´t be hornblende. A pink mineral won´t be pyrite.

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