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Russian Gemstones Encyclopedia

Vladimir Bukanov. Russian Gemstones Encyclopedia

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BRAZILIANITE


BRAZILIANITE (Brazilianit—Brazilianite—Ѕразилианит) (Pough, F.H. & Henderson, E.P. 1945), after Brazil, the country of its discovery. Phosphate – NaAl3[(OH)4|(PO4)2], monoclinic system. Hardness 5.5. Density 2.9. Glass luster. Perfect cleavage in one direction. Fragile. Brazilianite is found in the form of prismatic, richly edged crystals of the short-columnar shape. Color: pale golden-yellow, also greenish-yellow and olive-green. Transparent to translucent. It looks like amblygonite, apatite, chrysoberyl, noble beryl and topaz. It is found at hydrothermal deposits and in granite pegmatites. At first, gem-quality brazilianite was discovered in Brazil, in pegmatites of the region of Conselheiro Pena, near Divino das Laranjeiras, Minas Gerais in 1942. Besides, they found it in the same region at the deposits Córrego do Frio and Galiléia, near Linopolis. The biggest transparent crystals were up to 20 cm. long, 16 cm. in cross-section and 2 kg. in weight there. In the Paraíba State, crystals brazilianite of less size at the Piedras Lavradas mine, was found. In the U.S.A., transparent brazilianite in crystals up to 15x10 mm. was discovered in the New Hampshire at the Palermo deposit, Grafton Co.; and at the Smith deposit, near Newport. Besides, findings of brazilianite are known in South Africa, near Anniesfontein, Northern Cape; and in Rwanda, at the Buranga deposit.

In the AMNH, N.Y., there are two faceted Brazilian stones – 23 and 19 ct.; and in the Smiths. Inst., Wash., there is the biggest faceted brazilianite – 41.9 ct. and a stone in 17 ct. At the gemstones show in Tucson, the U.S.A. in 1997, the price of a collection druse of brazilianite with crystals up to 8 cm. long reached $15,000.

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