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Bityite
Bityite is considered a rare mineral, and it is an endmember to the margarite mica sub-group found within the phyllosilicate group. The mineral was first described by Antoine François Alfred Lacroix in 1908, and later its chemical composition was concluded by Professor Hugo Strunz.〔Strunz, H. (1956) Bityit, ein berylliumglimmer. Zeitschrift für Kristallographie, 107, 325-330.〕 Bityite has a close association with beryl, and it generally crystallizes in pseudomorphs after it, or in cavities associated with reformed beryl crystals.〔Lahti, S. I. and Saikkonen, R. (1985) Bityite 2M1 from Eräjärvi compared with related Li-Be brittle micas. Bulletin of the Geological Society of Finland, 57, 207-215.〕 The mineral is considered a late-stage constituent in lithium bearing pegmatites,〔Lin, J-C. and Guggenheim, S. (1983) The crystal structure of a Li,Be-rich brittle mica: a dioctaheral-trioctahedral intermediate. American Mineralogist, 68, 130-142.〕 and has only been encountered in a few localities throughout the world. The mineral was named by Lacroix〔Lacroix, A. (1908) Les minéraux de felons de pegmatite à tourmaline lithique de Madagascar. Bulletin de la Société de Française et de Minéralogie, 31, 218-247〕 after Mt. Bity, Madagascar from where it was first discovered.
==Geologic occurrence==
The first description of bityite was by Lacroix in 1908.〔 and it was discovered on Mt. Bity, Madagascar within a pegmatite named Sahatany field (). It was later found in a feldspar quarry from Londonderry, Western Australia(),〔Rowledge, H.P. and Hayton, J.D. (1947) Two new beryllium minerals from Londonderry. Journal and Proceedings of the Royal Society of Western Australia, 33, 45-52.〕 and further occurrences have been found from the Middle Urals(), and three pegmatites in Zimbabwe().〔Gallagher, M.J. and Hawkes, J.R. (1966) Beryllium minerals from Rhodesia and Uganda. Bulletin of the Geological Survey of Great Britain, 25, 59-75.〕 And most recently, occurrences from the Pizzo Marcio, Val Vigezzo area in Piedmont, Italy() have been discovered.〔 The most recent analysis for bityite found in the literature is for a sample from the Maantienvarsi pegmatite dyke in the Eräjärvi area in Orivesi (), southern Finland.〔 The sample from Maantienvarsi occurs in close association with beryl; either in cavities with altered beryl crystals, or as a pseudomorph after beryl.〔 The mineral has been found in cavities with perthic microcline, albitic plagioclase, muscovite and tourmaline; the pseudomorphs filled with bityite have been found to contain amounts of fluorite, bertrandite, fluorapatite, quartz and beryl.〔 The mineral substitutes into portions of beryl crystals, and is either a hydrothermal alteration product or a late stage magmatic mineral.〔
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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