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Hawthorne, F. C., Groat, L. A. (1986) The crystal structure and chemical composition of cumengéite. Mineralogical Magazine, 50 (355) 157-162 doi:10.1180/minmag.1986.050.355.21

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Reference TypeJournal (article/letter/editorial)
TitleThe crystal structure and chemical composition of cumengéite
JournalMineralogical MagazineISSN0026-461X
AuthorsHawthorne, F. C.Author
Groat, L. A.Author
Year1986 (March)Volume50
Issue355
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_50/50-355-157.pdf+
DOIdoi:10.1180/minmag.1986.050.355.21Search in ResearchGate
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Mindat Ref. ID3827Long-form Identifiermindat:1:5:3827:4
GUID0
Full ReferenceHawthorne, F. C., Groat, L. A. (1986) The crystal structure and chemical composition of cumengéite. Mineralogical Magazine, 50 (355) 157-162 doi:10.1180/minmag.1986.050.355.21
Plain TextHawthorne, F. C., Groat, L. A. (1986) The crystal structure and chemical composition of cumengéite. Mineralogical Magazine, 50 (355) 157-162 doi:10.1180/minmag.1986.050.355.21
In(1986, March) Mineralogical Magazine Vol. 50 (355) Mineralogical Society
Abstract/NotesAbstractThe crystal structure of cumengéite, Pb21Cu20Cl42(OH)40, tetragonal, a= 15.065(2), c= 24.436(5) Å, V = 5546(2) Å3, space group I4/mmm, Z = 2, has been solved by direct methods and refined by least-squares to an R index of 7.1 % for 1158 observed (I > 2.5σ I) reflections. The cumengéite structure shows a very diverse range of cation coordinations. There are five distinct Pb sites with the following coordination polyhedra: octahedron, square antiprism, augmented trigonal prism, a very distorted biaugmented trigonal prism and a fairly regular biaugmented trigonal prism, the latter being only half-occupied; there are two distinct Cu sites with octahedral and square pyramidal coordination respectively. The coordination polyhedra share elements to form prominent columns or rods of polyhedra parallel to the c-axis and centred on the 4-fold axes of the unit cell. These rods form a body-centred array, and link by sharing elements of their coordination polyhedra.

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Cumengeite

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Hawthorne, F. C. (1985) Refinement of the crystal structure of botallackite. Mineralogical Magazine, 49 (350) 87-89 doi:10.1180/minmag.1985.049.350.12
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Clark, A. M. (1986) Editorial. Mineralogical Magazine, 50 (355) 1 doi:10.1180/minmag.1986.050.355.01
Hawthorne, F. C., Grundy, H. D. (1977) The crystal chemistry of the amphiboles. III: Refinement of the crystal structure of a sub-silicic hastingsite. Mineralogical Magazine, 41 (317) 43-50 doi:10.1180/minmag.1977.041.317.07
Sokolova, E., Cámara, F., Hawthorne, F. C., Pautov, L. A. (2016) From structure topology to chemical composition. XX. Titanium silicates: the crystal structure of hejtmanite, Ba2Mn4Ti2(Si2O7)2O2(OH)2F2, a Group-II TS-block mineral. Mineralogical Magazine, 80 (5) 841-853 doi:10.1180/minmag.2016.080.026
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Cámara, F., Sokolova, E., Hawthorne, F. C., Abdu, Y. (2008) From structure topology to chemical composition. IX. Titanium silicates: revision of the crystal chemistry of lomonosovite and murmanite, Group-IV minerals. Mineralogical Magazine, 72 (6) 1207-1228 doi:10.1180/minmag.2008.072.6.1207
Sameshima, T. (1986) Ferrierite from Tapu, Coromandel Peninsula, New Zealand, and a crystal chemical study of known occurrences. Mineralogical Magazine, 50 (355) 63-68 doi:10.1180/minmag.1986.050.355.09
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Sokolova, E., Cámara, F., Hawthorne, F. C. (2011) From structure topology to chemical composition. XI. Titanium silicates: crystal structures of innelite-1T and innelite-2M from the Inagli massif, Yakutia, Russia, and the crystal chemistry of innelite. Mineralogical Magazine, 75 (4) 2495-2518 doi:10.1180/minmag.2011.075.4.2495
Hawthorne, F. C., Simmons, W. B. (2010) The crystal structure of zigrasite, MgZr(PO4)2(H2O)4, a heteropolyhedral framework structure. Mineralogical Magazine, 74 (3) 567-575 doi:10.1180/minmag.2010.074.3.567
 
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