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A test of the stone with a dichroscope can easily distinguish these from genuine tanzanite, as only tanzanite will appear doubly refractive: the two viewing windows of the dichroscope will display different colors (one window blue, the other violet) when viewing genuine tanzanite, while the imitation stones are all singly refractive and will ...
Zoisite may be blue to violet, green, brown, pink, yellow, gray, or colorless. Blue crystals are known under the name tanzanite. It has a vitreous luster and a conchoidal to uneven fracture. When euhedral, zoisite crystals are striated parallel to the principal axis (c-axis). Also parallel to the principal axis is one direction of perfect cleavage.
Tanzanite Bridge: 125 m (410 ft)(x4) 1,030 m (3,380 ft) Extradosed Concrete box girder deck, 5 concrete pylons 85+4x125+85: Road bridge Msimbazi delta. 2022: Dar es ...
Small-scale Tanzanian miner Saniniu Laizer struck a rare-gem lottery for the third time this summer, unearthing a 14-pound hunk of tanzanite worth $2 million. In June he had mined two stones ...
The altered ore type contains coarse flakes of graphite, often associated with tsavorite and tanzanite. A phosphate mine, in the north, near Minjingu stopped production in the 1990s before rehabilitation got underway in the mid-2000s. Because of its high growth economy, cement for building construction is an important natural resource.
Holystoning the deck was part of regulations for British-owned Emigration vessels in 1848, "11. Duties of the sweepers to be to clean the ladders, hospitals, and round houses, to sweep the decks after every meal, and to dry-holystone and scrape them after breakfast."