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Russian Gemstones Encyclopedia

Vladimir Bukanov. Russian Gemstones Encyclopedia

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BROMELLITE


BROMELLITE (Bromellit—Bromellite—Ѕромеллит) (Aminoff, G. 1925), after Magnus von Bromell (1679-1731), a Swedish physician and mineralogist. Oxide – BeO, hexagonal system. Hardness 8.5-9. Density 3. Glass luster. Cleavage in two directions. Fragile. Bromellite is extremely rare mineral. It was found first of all in Sweden, at the Långban mine, Värmland Region, in a calcite vein in the shape of small transparent columnar crystals. In Russia, at the Izumrudnye Kopi, in the Middle Urals, they found crystals up to 10 cm. long, sometimes available for faceting. So, in 1966, in extracted ore they found a piece of talcum schist with monomineral isolation of bromellite, 140x120x105 mm. in size, and 5 kg. in mass. Its colorless transparent crystals were up to 10 mm. long. There is information about findings of this mineral in Russia: in Karelia, at the Pitkaranta deposit, Northern Ladoga Region; also in Eveslogchorr Mt. Khibihy, Kola Penin.
Synthesis. Synthetic bromellite has been being manufactured since 1976. It attracts jewelers with its high hardness and the index of refraction close to the same of corundum. It is grown mainly with the method of crystallization from solution in melted mass. The shape of colorless crystals depends on the conditions of their synthesis. For hand faceting it is dangerous, because it gives toxic powder of Beryllium oxide.
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