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Bursaite
Bursaite is a sulfosalt of the lillianite family. It has the formula Pb5Bi4S11 and orthorhombic structure. Bursaite is named after Bursa Province, Turkey, where it was discovered.〔Rasit, T. (1954-55) (A study on the concentration tests and beneficiation of the Uludag tungsten ore ). Bull. Mineral Research and Exploralion Inst. Turkey, Foreign Ed., No. 46-47, 106-127.〕 It is generally located in regions rich in sulfur and commonly occurs alongside other sulfosalts. Its areas of formation are usually those that were once volcanogenic because it is generally aggregated with other minerals under intense heating.〔Borodaev, Y., Garavelli, A., Garbarino, C, Grillo, S, Mozgova, N, Uspenskaya, T. A Rare Sulfosalts from Volcano. (2001) The Canadian Mineralogist, 39 1383-1396.〕 It was officially delisted as a mineral in 2006, being cited as an intergrowth of two other sulfosalts.
==History==
Bursaite was discovered in a contact zone between a set of marbles and granites amidst the Uludag massif in Bursa, Western Turkey, by scientist Rasit Tolun in 1955.〔 Tolun was also the first to study the chemical composition of bursaite via flotation and superpanner tests. It was originally tested as an aggregate of a larger sulfosalt specimen. The flotation test involved sodium-based reagents and oils. The specimen was also chemically analyzed via X-ray spectroscopy and contained 4.24% pyrite, 4.78% blende, 5.48% bismuth and 85.3% Pb5Bi4S11. From these results, bursaite's composition was deduced as 45% Pb, 1% Ag, 38.5% Bi and 14.7% S.〔
Bursaite is named after the Bursa Province of Turkey where it was discovered.〔 After much discussion of bursaite's credibility as a mineral,〔 it was eventually delisted as part of a mass discreditation of minerals.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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