• Question: what makes crystals different colors?

    Asked by anon-185030 to William on 8 Nov 2018.
    • Photo: William Glass

      William Glass answered on 8 Nov 2018:

      Crystals are usually different colours due to the presence of different metal ions (e.g. Ca2+). This causes the light to behave differently when it hits the crystal and we see this as different colours.

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