Attention Deficit Disorder Prosthetic Memory Program

Tanzanite

ADDPMP252
Tanzanite - © Attention Deficit Disorder Prosthetic Memory Program

Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate), caused by small amounts of vanadium. Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Tanzania, in a very small mining area (approximately 7 km (4.3 mi) long and 2 km (1.2 mi) wide) near the Mererani [sw] Hills.

Tanzanite is noted for its remarkably strong trichroism, appearing alternately blue, violet and burgundy depending on crystal orientation. Tanzanite can also appear differently when viewed under different lighting conditions. The blues appear more evident when subjected to fluorescent light and the violet hues can be seen readily when viewed under incandescent illumination. In its rough state tanzanite is colored a reddish brown to clear, and it requires heat treatment to remove the brownish “veil” and bring out the blue violet of the stone.

The gemstone was given the name ‘tanzanite’ by Tiffany & Co. after Tanzania, the country in which it was discovered. The scientific name of “blue-violet zoisite” was not thought to be sufficiently consumer friendly by Tiffany’s marketing department, who introduced it to the market in 1968. In 2002, the American Gem Trade Association chose tanzanite as a December birthstone, the first change to their birthstone list since 1912.

Armoured Presidential Limousine - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP065
Armoured Presidential Limousine
St. Elmo's Fire - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP120
St. Elmo's Fire
Camouflaged Cell Phone Towers - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP387
Camouflaged Cell Phone Towers
Telephone drawing - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP028
Telephone drawing
Rungrado 1st of May Stadium - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP377
Rungrado 1st of May Stadium
Polyphemus - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP130
Polyphemus
Kirov Reservoir - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP544
Kirov Reservoir
Number Of The Beast - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP169
Number Of The Beast
Savonius Wind Turbine - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP382
Savonius Wind Turbine
Autumn Evening - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP384
Autumn Evening
Pellegrina - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP457
Pellegrina

You are using an outdated browser.
Please upgrade your browser to improve your experience.