What is the chemical formula for quartz?
The chemical formula for quartz, Earth’s second-most abundant mineral, is SiO2 (silicon dioxide.)
Did you know amethyst and citrine are actually varieties of quartz? Impurities such as iron (found in both amethyst and citrine) cause quartz to vary in color.
Varieties of quartz (top right, pure quartz)
Image credit: Mauro Cateb
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