ALACRANITE, AS8S9: STRUCTURAL STUDY OF THE HOLOTYPE AND RE-ASSIGNMENT OF THE ORIGINAL CHEMICAL FORMULA
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dc.contributor.author | Bonazzi P. | |
dc.contributor.author | Bindi L. | |
dc.contributor.author | Pratesi G. | |
dc.contributor.author | Menchetti S. | |
dc.contributor.author | Popova V. | |
dc.date.accessioned | 2021-11-23T00:58:45Z | |
dc.date.available | 2021-11-23T00:58:45Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13440516 | |
dc.identifier.citation | American Mineralogist, 2003, 88, 11-12 Part 1, 1796-1800 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/32398 | |
dc.description.abstract | Alacranite from the type locality (Uzon caldera, Kamchatka, Russian Federation) was submitted for structural analysis. A single crystal was selected and the following lattice parameters were determined: a = 9.942(4), b = 9.601(2), c = 9.178(3) Å, β = 101.94(3)°, V = 857.1 (5) Å3. The crystal structure was solved in the P2/c space group using direct methods and refined to R = 6.79% for 472 observed reflections. The structure of alacranite consists of an ordered sequence of As4S4 and As4S5 cage-like molecules, with a molecular packing closely resembling that found in the β-As4S4 phase. Both As-As and As-S intramolecular distances are in the range usually observed for covalent bonds. The structural model confirms the chemical formula As8S9 for alacranite, and accounts for differences in the unit-cell parameters of alacranite compared to those of the natural analogue of β-As4S4. This latter mineral, therefore, should receive a new name. | |
dc.subject | Alacranite | |
dc.subject | Uzon caldera | |
dc.subject | Kamchatka | |
dc.title | ALACRANITE, AS8S9: STRUCTURAL STUDY OF THE HOLOTYPE AND RE-ASSIGNMENT OF THE ORIGINAL CHEMICAL FORMULA | |
dc.type | Статья |
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