Tanzanite
Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate). The color is caused by small amounts of vanadium.
Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate). The color is caused by small amounts of vanadium.
Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate). The color is caused by small amounts of vanadium.
Source: Wikipedia "Tanzanite" · CC BY-SA 4.0
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