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gehlenite
Gehlenite, (Ca2Al()), is a sorosilicate, Al-rich endmember of the melilite complete solid solution series with akermanite.〔Deer et al., 1993〕〔(Gehlenite: Gehlenite mineral information and data )〕
The type locality is in the Monzoni Mountains, Fassa Valley in Trentino in Italy,〔 and is named after Adolf Ferdinand Gehlen (1775–1815) by A.J. Fuchs in 1815.〔Dana et al. 1997〕
==Geological occurrence==
Gehlenite is found in carbonaceous chondrites from which it condensed as a refractory mineral in the hotter stages (FU Ori) of the presolar nebula,〔Grossman L (1972) Condensation in the primitive solar nebula, Geochemica et Cosmochemica Acta, 36, 597-619〕 and was subsequently consumed in processes which created enstatite and other more abundant minerals making it a remanent (badword) mineral from the early solar nebula (along with corrundum and spinel). Its occurrence (badword) in the early condensation phase of the solar nebula was predicted by Harry Lord in the 1950s, but studies of carbonaceous chondrites did not support this claim until the Allende meteorite was discovered in 1969.〔''Exploring the Planets'' lecture by Archibald Reid. The University of Houston〕 It is also found in diorite intruded carbonate rocks,〔Carmichael ISE, Turner FJ, Verhoogen J (1974) Igneous Petrology, 37〕 and to a far lesser extent in uncompahgrites,〔Le Maitre RW (2002), Igneous Rocks, 11, 153〕 melilitites,〔 alnoites,〔Nixon PH (1987) Mantle Xenoliths, 102-103, 336, 450-451〕 lamprophyres and possibly kimberlite pipes.〔Skinner EMW, Mahotkin IL, Grutter HS (1999) Melilite in Kimberlites, Proceedings of the International Kimberlite Conference, 7, 788-794〕
Gehlenite has also been found on the comet 81P/Wild.〔(Mindat page for Comet Wild 2 (Comet 81P) )〕
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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