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MINERAL PROPERTIES: COLOR. Iron is usually responsible for dark red or brown colors, manganese and cobalt for pink, and chromium for deep green. Some minerals, such as Cassiterite and Zincite, have a chemical structure that would cause them to be colorless if pure, but due to impurities that are always present, they are never found colorless.
Fluorite comes in a wide range of colors and has consequently been dubbed “the most colorful mineral in the world”. Every color of the rainbow in various shades are represented by fluorite samples, along with white, black, and clear crystals. The most common colors are purple, blue, green, yellow, or colorless. Why Is Fluorites Streak White?
What Causes Color in Minerals? To greatly simplify this exceptionally complex subject, here are the 4 most widely agreed upon causes of color in allochromatic minerals: 1. Impurities. Tiny amounts - as little as one tenth of 1% - of an impurity in the molecular structure of a mineral can determine that mineral's color.
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