|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
Universitaet Wien, Institut fuer Mineralogie und Kristallographie, Vienna, Austria
Synthetic nagyagite was grown from a melt as part of a search for materials with high-temperature superconductivity. Electron microprobe analyses of synthetic nagyagite and of nagyagite from the type locality Nagyag. Transylvania (now Sacarimb, Romania) agree with data from literature. The crystal chemical formula [Pb(Pb,Sb)S 2 ][(Au,Te)] was derived from crystal structure investigations. Nagyagite is monoclinic pseudotetragonal. The average crystal structure was determined from both synthetic and natural samples and was refined from the synthetic material to R = 0.045 for 657 single-crystal X-ray data: space group P2 1 /m, a = 4.220(1) Aa, b = 4.176(1) Aa, c = 15.119(3) Aa, beta = 95.42(3) degrees , and Z = 2. Nagyagite features a pronounced layer structure: slices of a two slabs thick SnS-archetype with formula Pb(Pb,Sb)S 2 parallel to (001) have a thickness of 9.15 Aa. Te and Au form a planar pseudo-square net that is sandwiched between the SnS-archetype layers; it is assumed that planar Au (super [4Te]) Te 4 configurations are edge connected to chains and that Te atoms are in a zigzag arrangement. Ordering within the SnS-archetype and gold-tellurium layers, intense twinning and/or stacking variants are responsible for the often observed superstructure reflections. For buckhornite, [(Pb 2 Bi) (sub Sigma 3) S 3 ] [(AuTe 2 ) (sub Sigma 3) ], a structure model is proposed considering a homologous series with nagyagite, [(Pb 3 (Pb,Sb) 3 ) (sub Sigma 6) S 6 ] [(Au,Te) 3 ].
This record provided courtesy of AGI/GeoRef.
This article has been cited by other articles:
|
|
 |
|
  W. H. Paar, Y. Moelo, N. N. Mozgova, N. I. Organova, C. J. Stanley, A. C. Roberts, F. J. Culetto, H. S. Effenberger, D. Topa, H. Putz, et al. Coiraite, (Pb,Sn2+)12.5As3Fe2+FormulaS28:a franckeite-type new mineral species from Jujuy Province, NW Argentina Mineralogical Magazine, March 23, 2009; 72(5): 1083 - 1101. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Y. Moelo, E. Makovicky, N. N. Mozgova, J. L. Jambor, N. Cook, A. Pring, W. Paar, E. H. Nickel, S. Graeser, S. Karup-Moller, et al. Sulfosalt systematics: a review. Report of the sulfosalt sub-committee of the IMA Commission on Ore Mineralogy European Journal of Mineralogy, February 1, 2008; 20(1): 7 - 46. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 E. Makovicky Crystal Structures of Sulfides and Other Chalcogenides Reviews in Mineralogy and Geochemistry, January 1, 2006; 61(1): 7 - 125. [Full Text] [PDF]
|
|
|
|
|
|
L. BINDI and C. CIPRIANI Museumite, Pb5AuSbTe2S12, a new mineral from the gold-telluride deposit of Sacarimb, Metaliferi Mountains, western Romania European Journal of Mineralogy, October 1, 2004; 16(5): 835 - 838. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. Kyono, A. Kyono, and M. Kimata Structural reinvestigation of getchellite As0.98Sb1.02S3.00 American Mineralogist, May 1, 2004; 89(5-6): 696 - 700. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. J. Cook, N. J. Cook, and C. L. Ciobanu Bismuth tellurides and sulphosalts from the Larga hydrothermal system, Metaliferi Mts., Romania: Paragenesis and genetic significance Mineralogical Magazine, April 1, 2004; 68(2): 301 - 321. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
