Trace amounts of other minerals in the crystalline structure of the SiO4.
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the colors of quartz is clear, pink, purple, and green
When you look at a rock and see different colors, those colors are minerals .The pressure and heat causes the minerals in the rock to change into different minerals which cause the different colors in the rocks.
Quartz is found in all colors. Colorless, purple, yellow, smoky, and pink are the most common; blue, greens and bright reds are more unusual.
Amethyst, rose, citrine, smoky, etc., are all examples of quartz. Few minerals come in such an amazing array of colors and crystal habits!
It depends how much iron it has inside. Quartz can also be clear transparent, milky white, pink, yellow, and even purple.