Heliophyllite: a discredited mineral species identical to ecdemite

Abstract. The type material for heliophyllite, preserved in the Swedish Museum of Natural History in Stockholm, was re-investigated through a combined EPMA (electron probe X-ray microanalysis), Raman, and X-ray powder diffraction (XRPD) and single-crystal study. EPMA chemical data, together with Raman and single-crystal structural studies, point to heliophyllite being identical to ecdemite. XRPD synchrotron data highlight the presence of a minor quantity of finely admixed finnemanite in the analyzed material, explaining the presence of some additional diffraction peaks, not indexable with the ecdemite unit cell, reported in the literature. The discreditation of heliophyllite has been approved by the IMA Commission on New Minerals and Mineral Names (proposal 19-H, 2019).

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Spectra–structure relationship: Syntheses, characterization, single crystal X-ray structural studies and packing analyses of two novel copper(II) complexes: [Cu(pyridine)2(H2O)4](p-toluenesulfonate)2 and [Cu(β-picoline)2(H2O)4](p-toluenesulfonate)2

Journal of Molecular Structure ◽

10.1016/j.molstruc.2011.02.043 ◽

2011 ◽

Vol 994 (1-3) ◽

pp. 21-28 ◽

Cited By ~ 3

Author(s):

Raj Pal Sharma ◽

Anju Saini ◽

Sukhjinder Singh ◽

Ajnesh Singh ◽

Paloth Venugopalan ◽

...

Keyword(s):

Single Crystal ◽

Structural Studies ◽

X Ray ◽

Structure Relationship

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Single-crystal study of the m = 2 tubular cobalt oxide, Bi4Sr12Co8O30−δ

Acta Crystallographica Section B Structural Science ◽

10.1107/s0108768101018444 ◽

2002 ◽

Vol 58 (2) ◽

pp. 191-197 ◽

Cited By ~ 2

Author(s):

O. Perez ◽

A. C. Masset ◽

H. Leligny ◽

G. Baldinozzi ◽

D. Pelloquin ◽

...

Keyword(s):

Single Crystal ◽

Cobalt Oxide ◽

Accurate Description ◽

Orthorhombic Symmetry ◽

X Ray Diffraction ◽

X Ray ◽

Single Crystal Study

The structure of the m = 2 tubular compound Bi4Sr12Co8O30−δ, bismuth strontium cobalt oxide, was determined by single-crystal X-ray diffraction. This phase of orthorhombic symmetry exhibits a very strong tetragonal pseudosymmetry. The structure consists of 90°-oriented Bi2Sr2CoO6+δ slices, four Co atoms wide, forming [Sr4Co4O13]∞ pillars at their intersection. The Co atoms in these pillars form four corner-sharing CoO5 bipyramids. In the resulting [Co4O13] cluster, an anionic disorder is evidenced and discussed. Then, an accurate description of the particular structure of the pillars is given. Finally, a comparison with the Mn tubular compound Bi3.6Sr12.4Mn8O30−δ is carried out.

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Comparative Structural Studies on Three-Coordinate Copper(I) Halide Complexes With Tertiary Phosphines. Crystal Structures of [(PPh2Mes)CuX]2 and [(PPhMes2)CuX]2 (Mes = Mesityl X = Cl, Br, I)

Australian Journal of Chemistry ◽

10.1071/ch9921155 ◽

1992 ◽

Vol 45 (7) ◽

pp. 1155 ◽

Cited By ~ 11

Author(s):

GA Bowmaker ◽

D Camp ◽

RD Hart ◽

PC Healy ◽

BW Skelton ◽

...

Keyword(s):

Single Crystal ◽

Crystal Structures ◽

Copper Atom ◽

Structural Studies ◽

Coordination Environment ◽

X Ray ◽

Tertiary Phosphines ◽

Structure Determinations ◽

Halide Complexes ◽

The Subject

The 1 : 1 complexes of the substituted triphenylphosphine ligands mesityldiphenylphosphine and dimesitylphenylphosphine with copper(1) chloride, bromide and iodide have been the subject of single-crystal X-ray structure determinations at 295 K. All six complexes crystallize as air-stable dimeric molecules, [(PPh2Mes)CuX]2 and [ (PPhMes2)CUX]2 with each copper atom in a distorted trigonal PCuX2. coordination environment. Crystals of [(PPh2Mes)CuCl]2 (1) are monoclinic, P21/n, a 9.961(3), b 18.687(6), c 11.009(7) Ǻ, β 114.63(4)°; R was 0.049 for 2450 'observed' reflections. [(PPh2Mes)CuBrI2 (2) is monoclinic, P21/n, a 9.939(2), b 18.832(6), c 11.238(6) Ǻ, β 115.36(3)°; R was 0.046 for 1803 'observed' reflections. [(PPh2Mes)CuI]2.4/3 C6H6 (3) is rhornbohedral, R3, a 36.877(8), c 9.047(5) A; R was 0.039 for 2537 'observed' reflections. Crystals of [(PPhMes2)CuCl]2.2MeCN (4) are triclinic, Pi, a 15.783(7), b 9.570(4), c 8.914(4) Ǻ, α 72.43(3), β 76.37(3), γ 74.03(3)°; R was 0.045 for 3341 'observed' reflections. [(PPhMes2)CuBr]2.3C6H6 (5) is monoclinic, C2/c, a 9.694(6), b 30.15(2), c 20.66(2) Ǻ, β 98.00(7)°; R was 0.047 for 2117 'observed' reflections. [(PPhMes2)CuI]2.2MeCN (6) is orthorhombic, PP1nb, a 11.694(8), b 14.77(1), c 29.76(3) Ǻ; R was 0.049 for 3447 'observed' reflections. Cu-P bond lengths are: 2.196(2) A (1); 2.198(3) Ǻ (2); 2.222(5) and 2.226(5) Ǻ (3); 2.202(1) Ǻ (4); 2.197(3) A (5); 2.201(4) and 2.264(5) Ǻ (6). The geometries of the LCuX2 and CuX2Cu units are compared with data reported for other monomeric and dimeric compounds for both phosphorus- and nitrogen-based ligands L.

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Synthesis and X-ray structural studies of novel metal-organic complex: Diiodobis(2-aminopyridine)cadmium(II) single crystal

10.1063/1.4791322 ◽

2013 ◽

Author(s):

G. Venkatesan ◽

G. Babu Anandha ◽

P. Ramasamy

Keyword(s):

Single Crystal ◽

Structural Studies ◽

Organic Complex ◽

X Ray ◽

Metal Organic Complex ◽

Metal Organic

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Notizen: Einkristall-Strukturdaten einiger Fluoride und Cyanide A2IBIMIIIX6 der Elpasolithfamilie / Single Crystal Structural Data of Some Fluorides and Cyanides A2IBIMIIIX6 of the Elpasolite Family

Zeitschrift für Naturforschung B ◽

10.1515/znb-1975-5-632 ◽

1975 ◽

Vol 30 (5-6) ◽

pp. 462-464 ◽

Cited By ~ 24

Author(s):

R. Haegele ◽

W. Verscharen ◽

D. Babel

Keyword(s):

Single Crystal ◽

Structural Data ◽

Space Group ◽

X Ray ◽

Lattice Constants ◽

Structure Determinations ◽

Crystal Structural Data ◽

Crystal Structural

The parameters of complete X-ray structure determinations are given for the fluoridesRb2NaFeF6 and Rb2KFeF6 (cubic), Cs2NaCrF6 and Cs2NaFeF6 (hexagonal-rhom-bohedral) and Cs2LiGaF6 (hexagonal). Space group and lattice constants of the monoclinic cyanides Cs2BFe(CN)6 (B = Na, K, Rb) are reported as well.

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On the atomic interdiffusion in Co/Pt superlattices

Journal of Materials Research ◽

10.1557/jmr.1992.1309 ◽

1992 ◽

Vol 7 (6) ◽

pp. 1309-1312 ◽

Cited By ~ 19

Author(s):

X. Yan ◽

T. Egami ◽

E.E. Marinero ◽

R.F.C. Farrow ◽

C.H. Lee

Keyword(s):

Minor Component ◽

Diffraction Experiment ◽

X Ray Diffraction ◽

X Ray ◽

Diffraction Peaks ◽

Large Width ◽

A Minor ◽

Component Parallel

We have performed x-ray diffraction experiments on MBE grown 〈111〉 and 〈001〉 oriented Co (3 Å)/Pt (18 Å) superlattices with the scattering vector Q covering a plane that includes a major component perpendicular and a minor component parallel to the plane of the sample. The superlattice diffraction peaks were found to have a large width parallel to the plane of the film, indicating that there is strong in-plane disorder. These broad peaks were integrated to evaluate more accurately the amount of interdiffusion at the interface, which was found to be similar in both films, contrary to what the conventional x-ray diffraction experiment suggests.

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