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**TANZANITE**
Tanzanite is the
blue/purple variety of the mineral zoisite (a calcium aluminium
hydroxysilicate) which was discovered in the Mererani Hills of
Northern Tanzania in 1967, near the city of Arusha and Mount
Kilimanjaro. It is used as a gemstone. Tanzanite is noted for
its remarkably strong trichroism, appearing alternately sapphire
blue, violet and burgundy depending on crystal orientation.
Tanzanite can also appear differently when viewed under
alternate lighting conditions. The blues appear more evident
when subjected to fluorescent lightand the violet hues can be
seen readily when viewed under incandescent illumination.
Tanzanite in its rough state is usually a reddish brown color.
It requires artificial heat treatment to 600 °C in a gemological
oven to bring out the blue violet of the stone. Tanzanite is a
rare gem.It is found mostly in the foothills of Mount
Kilimanjaro. The mineral is named after Tanzania, the country in
which it was discovered
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