Smamite, Ca2Sb(OH)(4)[H(AsO4)(2)]center dot 6H(2)O, a new mineral and a possible sink for Sb during weathering of fahlore
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00116942" target="_blank" >RIV/00216224:14310/20:00116942 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.2138/am-2020-7133" target="_blank" >https://doi.org/10.2138/am-2020-7133</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2138/am-2020-7133" target="_blank" >10.2138/am-2020-7133</a>
Alternative languages
Result language
angličtina
Original language name
Smamite, Ca2Sb(OH)(4)[H(AsO4)(2)]center dot 6H(2)O, a new mineral and a possible sink for Sb during weathering of fahlore
Original language description
Smamite, Ca2Sb(OH)(4)[H(AsO4)(2)]center dot 6H(2)O, is a new mineral species from the Giftgrube mine, Rauenthal, Sainte-Marie-Aux-Mines ore-district, Haut-Rhin department, France. It is a supergene mineral found in quartz-carbonate gangue with disseminated to massive tennantite-tetrahedrite series minerals, native arsenic, Ni-Co arsenides, and supergene minerals picropharmacolite, fluckite, and pharmacolite. Smamite occurs as lenticular crystals growing in aggregates up to 0.5 mm across. The new mineral is whitish to colorless, transparent with vitreous luster and white streak; non-fluorescent under UV radiation. The Mohs hardness is3(1/2); the tenacity is brittle, the fracture is curved, and there is no apparent cleavage. The measured density is 2.72(3) g/cm(3); the calculated density is 2.709 g/cm(3) for the ideal formula. The mineral is insoluble in H2O and quickly soluble in dilute (10%) HCl at room temperature. Optically, smamite is biaxial (-), alpha = 1.556(1), beta = 1.581(1), gamma = 1.588(1) (white light). The 2V (meas) = 54(1)degrees; 2V (calc) = 55.1 degrees. The dispersion is weak, r > gamma. Smamite is non-pleochroic. Electron microprobe analyses provided the empirical formula Ca-2 center dot 03Sb(0.97)(OH)(4)[H-1.10(As1.99Si0.01O4)(2)]center dot 6H2O. Smamite is triclinic, P (1) over bar, alpha = 5.8207(4), b = 8.0959(6), c = 8.21296(6) angstrom, alpha = 95.8343(7)degrees, beta = 110.762(8)degrees, gamma = 104.012(7)degrees, V = 402.57(5) angstrom 3, and Z = 1. The structure (Robs = 0.027 for 1518 I>3sI reflections) is based upon {Ca-2(H2O)(6)Sb(OH)(4)[H(AsO4)(2)]} infinite chains consisting of edge-sharing dimers of Ca(H2O)(3)O-2(OH)(2) polyhedra that share edges with Sb(OH)(4)O-2 octahedra; adjacent chains are linked by H-bonds, including one strong, symmetrical H-bond with an O-H bond-length of similar to 1.23 angstrom. The name smamite is based on the acronym of the Sainte-Marie-aux-Mines district.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10504 - Mineralogy
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
American Mineralogist
ISSN
0003-004X
e-ISSN
1945-3027
Volume of the periodical
105
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
555-560
UT code for WoS article
000523599300010
EID of the result in the Scopus database
2-s2.0-85083654690