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Grew, E. S., Hålenius, U., Kritikos, M., Shearer, C. K. (2001) New data on welshite, e.g. Ca2Mg3.8Mn0.62+Fe0.12+Sb1.55+O2[Si2.8Be1.7Fe0.653+Al0.7As0.17O18], an aenigmatite-group mineral. Mineralogical Magazine, 65 (5) 665-674 doi:10.1180/002646101317018488

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Reference TypeJournal (article/letter/editorial)
TitleNew data on welshite, e.g. Ca2Mg3.8Mn0.62+Fe0.12+Sb1.55+O2[Si2.8Be1.7Fe0.653+Al0.7As0.17O18], an aenigmatite-group mineral
JournalMineralogical Magazine
AuthorsGrew, E. S.Author
Hålenius, U.Author
Kritikos, M.Author
Shearer, C. K.Author
Year2001 (October)Volume65
Issue5
PublisherMineralogical Society
DOIdoi:10.1180/002646101317018488Search in ResearchGate
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Mindat Ref. ID243302Long-form Identifiermindat:1:5:243302:2
GUID0
Full ReferenceGrew, E. S., Hålenius, U., Kritikos, M., Shearer, C. K. (2001) New data on welshite, e.g. Ca2Mg3.8Mn0.62+Fe0.12+Sb1.55+O2[Si2.8Be1.7Fe0.653+Al0.7As0.17O18], an aenigmatite-group mineral. Mineralogical Magazine, 65 (5) 665-674 doi:10.1180/002646101317018488
Plain TextGrew, E. S., Hålenius, U., Kritikos, M., Shearer, C. K. (2001) New data on welshite, e.g. Ca2Mg3.8Mn0.62+Fe0.12+Sb1.55+O2[Si2.8Be1.7Fe0.653+Al0.7As0.17O18], an aenigmatite-group mineral. Mineralogical Magazine, 65 (5) 665-674 doi:10.1180/002646101317018488
Abstract/NotesAbstractElectron and ion microprobe data on two samples of welshite from the type locality of Långban, Sweden, gave analytical totals of 99.38–99.57 wt.% and BeO contents of 4.82–5.11 wt.%, corresponding to 1.692–1.773 Be/20 O. Mössbauer and optical spectra of one of these samples gave [iv]Fe3+/ΣFe = 0.91, [vi]Fe2+/ΣFe = 0.09, and no evidence of Mn3+. The resulting formula for this sample is Ca2Mg3.8Mn0.62+Fe0.12+Sb1.55+O2[Si2.8Be1.7Fe0.653+Al0.7As0.17O18, and that for the second sample, Ca2Mg3.8Mn0.12+Fe0.12+Fe0.83+Sb1.25+O2[Si2.8Be1.8Fe0.653+Al0.5As0.25O18], is related by the substitution involving tetrahedral and octahedral sites: 0.59[vi,iv](Fe,Al)3+ ≈ 0.42[vi](Mg,Mn,Fe)2+ + 0.21([vi]Sb,[iv]As)5+, i.e. 3[vi,iv]M3+ = 2[vi]M2+ + [vi,iv]M5+. Welshite is distinctive among aenigmatite-group minerals in the high proportion of Fe3+ in tetrahedral coordination and is unique in its Be content, substantially exceeding 1Be per formula unit. Given the cation distributions in other minerals related to aenigmatite, we think it is reasonable to assume that at least one tetrahedral site is >50% occupied by Be and that one octahedral site is >50% occupied by Sb, so that welshite should be retained as a distinct species with its own name in the aenigmatite group.

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Grew, E. S., Barbier, J., Britten, J., Halenius, U., Shearer, C. K. (2007) The crystal chemistry of welshite, a non-centrosymmetric (P1) aenigmatite-sapphirine-surinamite group mineral. American Mineralogist, 92 (1) 80-90 doi:10.2138/am.2007.2250
Moore, Paul B. (1978) Welshite, Ca2Mg4Fe3+Sb5+O2[Si4Be2O18], a new member of the aenigmatite group. Mineralogical Magazine, 42 (321) 129-132 doi:10.1180/minmag.1978.042.321.19
Barbier, J., Britten, J., Grew, E. S., Hålenius, Ulf, Scherbakova, Y.P., Shearer, C.K., Yates, M. (2004) Makarochikinite, Ca2Fe2+4Fe3+TiSi4BeAlO20 - a new member of the aenigmatite group, and the Ti dominant analogue of høgtuvaite. GFF, 126 (1) 65-66 doi:10.1080/11035890401261sn8
Grew, E. S., Hålenius, U., Pasero, M., Barbier, J. (2008) Recommended nomenclature for the sapphirine and surinamite groups (sapphirine supergroup) Mineralogical Magazine, 72 (4) 839-876 doi:10.1180/minmag.2008.072.4.839
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) New minerals and nomenclature modifications approved in 2018. Mineralogical Magazine, 82 (5) 1225-1232 doi:10.1180/mgm.2018.160
Grew, Edward S., Yates, Martin G., Shearer, Charles K., Wiedenbeck, Michael (1997) Werdingite from the Urungwe District, Zimbabwe. Mineralogical Magazine, 61 (408) 713-718 doi:10.1180/minmag.1997.061.408.11
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter 32. Mineralogical Magazine, 80 (5) 915-922 doi:10.1180/minmag.2016.080.084
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) CNMNC Newsletter 45, New minerals and nomenclature modifications approved in 2018. Mineralogical Magazine, 82 (5) 1225-1232 doi:10.1180/mgm.2018.160
Grice, J. D., Ferraris, G. (2001) New minerals approved in 2000 by the Commission on New Minerals and Mineral Names (CNMMN) International Mineralogical Association. Mineralogical Magazine, 65 (5) doi:10.1180/002646101317018514
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2017) New minerals and nomenclature modifications approved in 2017, CNMNC Newsletter No 39. Mineralogical Magazine, 81 (5) 1279-1286 doi:10.1180/minmag.2017.081.072
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 27. Mineralogical Magazine, 79 (5). 1223-1230 doi:10.1180/minmag.2015.079.5.16
 
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