Vivianite (hydrous iron phosphate) is a mineral that is colourless when first mined, but exposure
to air causes it to turn blue or green. It can be found in mineral-rich granite deposits, and is
usually associated with quartz and sphalerite. Localities of vivianite include the United States and
Bolivia. Since it is a semi-rare mineral, vivianite is only mined when available in substantial
amounts; it is used as a colouring agent.
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