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Mangani-pargasite, ...
Mangani-pargasite, NaCa2(Mg4Mn3+)(Si6Al2)O22(OH)2, a new mineral species of the amphibole supergroup
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- Hålenius, Ulf (author)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Swedish Museum Nat Hist, Dept Geosci, Box 50007, SE-10405 Stockholm, Sweden.
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- Bosi, Ferdinando (author)
- Sapienza Univ Rome, Dept Earth Sci, Piazzale Aldo Moro 5, I-00185 Rome, Italy.;UOS Roma, Ist Geol Ambientale & Geoingn, CNR, Rome, Italy.,Sapienza Università di Roma, Italy
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- Jonsson, Erik, 1967- (author)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Geol Survey Sweden, Box 670, SE-75128 Uppsala, Sweden.,Geological Survey of Sweden, Uppsala, Sweden
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(creator_code:org_t)
- EDIZIONI NUOVA CULTURA, 2020
- 2020
- English.
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In: Periodico di Mineralogia. - : EDIZIONI NUOVA CULTURA. - 0369-8963 .- 2239-1002. ; 89:2, s. 125-131
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https://urn.kb.se/re...
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Abstract
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- Mangani-pargasite, ideally NaCa2(Mg4Mn3+)(Si6Al2)O-22(OH)(2), is a new mineral species of the calcium amphibole subgroup of the amphibole supergroup. The type specimen was found on the mine dump of the Langban Fe-Mn-(Ba-As-Pb-Sb) deposit in Varmland, Sweden. Crystal chemical analyses resulted in the empirical chemical formula: (A)(Na0.90Pb0.07K0.03)(Sigma 1.00)(B)(Ca1.93Mn0.072+)(Sigma 2.00)(C)(Mg4.25Mn0.393+Al0.26Fe0.103+)Sigma(T)(5.00)(Si6.35Al1.65)Sigma 8.00O22W(OH)(2). In order to complete the description of this newly approved (IMA 2018-151) mineral we report here additional data to those published in papers by Jonsson and Halenius (2010) and Halenius and Bosi (2012). Mangani-pargasite is biaxial positive, with alpha=1.635(5), beta=1.645(5), gamma=1.660(5) and the measured optic angle 2V is 85(5)degrees. The dispersion is weak (r>v), and the optic orientation is: Y parallel to b; Z<^>c=25(3)degrees. Mangani-pargasite is red to brownish red with weak pleochroism; X=pale reddish brown, Y=pale reddish brown and Z=pale brownish red; X approximate to Y>Z. The unit-cell parameters are a=9.9448(5), b=18.0171(9), c=5.2829(3) angstrom, beta=105.445(3)degrees, V=912.39(9) angstrom(3), Z=2, space group C2/m. The ten strongest reflections in the X-ray powder diffraction pattern [d-values in angstrom, I, (h k l)] are: 8.420, 29, (110); 3.368, 17, (131), 3.279, 49, (240); 3.141, 100, (310); 2.817, 44, (33 0); 2.698, 21, (151); 2.389, 18, (350); 1.904, 29, (510); 1.650, 22, (461) and 1.448, 46, (661).
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Keyword
- Mangani-pargasite
- amphibole
- Langban
- Sweden
- The changing Earth
Publication and Content Type
- ref (subject category)
- art (subject category)
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