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Diomignite

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Formula:
Li2[B4O7]
Crystal System:
Tetragonal
Name:
Named by David London, Michael E. Zolensky, and Edwin Roedder in 1987 from the Greek διοσ "divine" and μιγνεν "mixture" because of the pronounced fluxing effects the compound has on hydrous granitic pegmatite fluids. The compound is also found in industrial processes and has been found in discarded commercial waste piles near factories or near shipping docks, land-fills, etc.
Synonym:
A synonym of Zabuyelite
Discredited (IMA 15-H proposal).

Thought to be, in general, a microscopic mineral found in fluid inclusions in beryl or spodumene. Later the inclusions turned out to be misidentified zabuyelite.

Originally reported first from the Tanco pegmatite, Bernic Lake, Canada.


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References for DiomigniteHide

Reference List:
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Krogh-Moe, J. (1962) The crystal structure of lithium diborate, Li2O·2B2O3. Acta Crystallographica: 15: 190-193.
London, D., Zolensky, M.E., Roedder, E. (1987) Diomignite: natural Li2B4O7 from the Tanco pegmatite, Bernic Lake, Manitoba. The Canadian Mineralogist: 25: 173-180.
Grew, E.S., Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Anderson, A.J., Clark, A.H., Gray, S. (2001) The occurrence and origin of zabuyelite (Li2CO3) in spodumene-hosted fluid inclusions: implications for the internal evolution of rare-element granitic pegmatites. The Canadian Mineralogist: 39: 1513-1527.
Thomas, R., Davidson, P. (2010) Hambergite-rich melt inclusions in morganite crystals from the Muiane pegmatite, Mozambique and some remarks on the paragenesis of hambergite. Mineralogy and Petrology: 100: 3-4, 227-239.
IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) - New minerals and nomenclature modifications approved in 2015 and 2016 - Nomenclature proposals approved in January 2016. [http://forum.amiminerals.it/viewtopic.php?f=5&t=12600]

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