...Kevin S. Knight; C. Michael B. Henderson; Simon M. Clark Abstract The crystal structures of eight tetragonal, gillespite-structured phases in the effenbergerite(BaCuSi 4 O 10 )–wesselsite (SrCuSi 4 O 10 ) solid solution (Sr 1− x Ba x CuSi 4 O 10 , where x is the mol fraction of the Ba end-member...

...F ig . 7. Unit-cell volumes in the wesselsite-effenbergerite solid solution series [modified after Knight et al. , 2010 ] in addition to values taken from the original description ( Giester and Rieck, 1996 : green rhomb) and the present study (red circle). ...

... on a specimen obtained as effenbergerite and was investigated because of its subtly different colouration from the dominant blue mass of this mineral. It is of note that the ‘effenbergerite’ was actually determined to be its Sr-analogue, wesselsite, SrCuSi 4 O 10 . The discovery of diegogattaite alongside...

... thus far, including effenbergerite BaCuSi 4 O 10 ( Giester and Rieck 1994 ) and scottyite, both originating from the same locality. Nevertheless, Ba-silicate compounds characterized by the general chemical formula BaM 2+ 2 Si 2 O 7 (M 2+ = Be, Mg, Mn, Fe, Co, Zn, and Cu) have been a subject...

..., e-mail: [email protected] 18 12 2006 26 06 2006 06 11 2006 © 2007 E. Schweizerbart’sche Verlagsbuchhandlung, D-70176 Stuttgart 2007 gillespite wesselsite effenbergerite powder neutron diffraction crystal structure thermal expansion Wesselsite (We...

.... wesselsite effenbergerite gillespite powder neutron diffraction phase transition high pressure Gillespite (BaFeSi 4 O 10 ), despite its mineralogical scarcity ( Schaller, 1922 , 1929 ), has been the focus of a number of detailed crystallographic and spectroscopic studies due to the presence...

...]-coordinated Th 4+ ion (Hawthorne et al. , 2019 ). The gillespite-group minerals (gillespite, cuprorivaite, effenbergerite and wesselsite) and ekanite have the same pattern of u and d tetrahedra in their four-membered rings. The interstitial complex in these minerals consists of one individual M 2+ ion...

... , C.F. ( 1987 ): Symmetry and crystal structure of monteregianite, Na 4 F 2 Y 2 Si 16 O 38 ·10H 2 O, a double-sheet silicate with zeolitic properties . Am. Mineral ., 72 , 365 – 374 . Giester , G. & Rieck , B. ( 1994 ): Effenbergerite, BaCu(Si 4 O 10 ), a new mineral from...

... with this hypothesis: cuprorivaite, CaCuSi 4 O 10 , with < [4] Cu-O> 1.93 Å ( Bensch and Schur 1995 ) is blue, as are its Ba and Sr analogues, effenbergerite and wesselsite, respectively ( Giester and Rieck 1994 , 1996 ). A search for further violet compounds containing Cu and O revealed about 35 examples...

... 1 /c Dai and Harlow ( 1992 ) 1992–033 Hennomartinite SrMn 3+ (Si 2 O 7 )(OH) 2 ·H 2 O Cmcm Armbruster et al. ( 1993 ) 1992–012 Poldervaartite (Ca,Mn 2+ ) 2 [SiO 3 (OH)] (OH) Pbca Dai et al. ( 1993 ) 1993–036 Effenbergerite BaCuSi 4 O 10 P 4 /ncc Giester and Rieck...

... Ca 7–x Na 2x (Si 4 O 10 ) 4 (OH) 2 (H 2 O) 15–x with x in the range 0–1. Cairncrossite joins the group of new silicate species from the Kalahari Manganese Field investigated up to now by the authors, like effenbergerite, BaCuSi 4 O 10 ( Giester & Rieck, 1994 ), wesselsite, SrCuSi 4 O 10...

... a subset of typical paragenesis of Ba-, Sr-, and Cu-bearing silicates effenbergerite-wesselsite, lavinskyite, scottyite, and diegogattaite, in close association with pectolite, quartz, aegirine, and richterite, minerals of the garnet group and a number of manganese and iron oxides with a dominance...

... and Mesoporous Materials , 90 , 32 – 38 . Giester G. and Rieck B. ( 1994 ) Effenbergerite, BaCu[Si 4 O 10 ], a new mineral from the Kalahari Manganese Field, South Africa: description and crystal structure . Mineralogical Magazine , 58 , 663 – 670 . Giester G. and Rieck B...

... silicates were described until recently, namely scottyite BaCu 2 (Si 2 O 7 ) ( Hentschel et al. 1993 ; Yang et al. 2013 ), effenbergerite BaCu(Si 4 O 10 ) ( Giester and Rieck 1994 ), cuprorivaite CaCu(Si 4 O 10 ) ( Minguzzi 1938 ; Mazzi and Pabst 1962 ), wesselsite SrCu(Si 4 O 10 ) ( Giester and Rieck...

... 2 Ca 2 [Si 8 O 19 (OH)] (H 2 O) 6 1:2.50 18 c (16) Folded sheets Gillespite group Cuprorivaite [4.8 2 ] 8 (u 4 ) 1 (d 4 ) 1 (u 2 d 2 u 2 d 2 ) 2 2F CaCu [Si 4 O 10 ] 1:2.50 19 a (17) Effenbergerite [4.8 2 ] 8 (u 4 ) 1 (d 4 ) 1 (u 2 d 2 u 2 d 2 ) 2 2F...

... in the wesselsite-effenbergerite (Sr1-xBaxCuSi4O10) solid solution . Eur. J. Mineral , 22 , 411 – 423 . Lahlil S. Lebon M. Beck L. Rousselière H. Vignaud C. Reiche I. Menu M. Paillet P. Plassard F. ( 2012 ): The first in situ micro-Raman spectroscopic analysis...