Fluorite

Colors It Comes In -

The most common colors are purple, blue, green, yellow, or colorless. Less common are pink, red, white, brown, and black.

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What Causes The Colors - 

Manganese: This impurity causes fluorite to turn brown or black.
Iron: This impurity causes fluorite to turn yellow, orange, or red.
Copper: This impurity causes fluorite to turn blue or green.
Yttrium: This impurity causes fluorite to turn purple.
Zirconium: Zirconium impurities can cause fluorite to appear orange or red.

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Fracture - Subconchoidal to Uneven

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Shape - Cubic

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Luster - Vitreous

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Texture - Waxy

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Streak - White

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Locality - South Africa, China, Mexico, Mongolia, the United Kingdom, the United States, Canada, Tanzania, Rwanda and Argentina.

If you want to find fluorite in the U.S., some of the best states to search for it are Utah, New Mexico, Kentucky, Arizona, and New York.

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Where It Can Be Found - Search for it in quarries, limestone cavities, and ore deposits, among other environments.

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Hardness On The Mohs Scale - 4 Out Of 10