tanzaniten.
/ˈtanzənʌɪt/ Mineralogy.
A highly pleochroic violet-blue gemstone that is a variety of zoisite in which some of the aluminium is replaced by vanadium.
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the world > the earth > minerals > types of mineral > silicates > epidote group > [noun] > zoisite
zoisite1805
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tanzanite1968
society > occupation and work > materials > raw material > gem or precious stone > less identifiable gems > [noun] > blue stone
ewage1377
tanzanite1968
1968 Wall St. Jrnl. 14 Oct. 4/1 Tiffany & Co. disclosed discovery of a rare gemstone that the firm's vice president, Henry B. Platt, has named tanzanite. The gem, discovered last year in Africa's Tanzania, has the blue coloring and relative transparency of a sapphire.
1975 National Geographic Apr. 490/1 I take a dusty detour to see the mining of glorious gems of transparent purplish blue. Tiffany's has named them tanzanites.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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