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Erssonite, CaMg7Fe2...
Erssonite, CaMg7Fe23+(OH)(18)(SO4)(2)center dot 12H(2)O, a new hydrotalcite-supergroup mineral from Långban, Sweden
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- Zhitova, Elena S. (author)
- Russian Acad Sci, Inst Volcanol & Seismol, Buivar Piypa 9, Petropavlovsk Kamchatski 683006, Russia.
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- Chukanov, Nikita, V (author)
- Russian Acad Sci, Inst Problems Chem Phys, Akad Semenova 1, Chernogolovka 142432, Russia.
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- Jonsson, Erik, 1967- (author)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Geol Survey Sweden, Dept Mineral Resources, Box 670, SE-75128 Uppsala, Sweden.
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- Pekov, Igor, V (author)
- Moscow MV Lomonosov State Univ, Fac Geol, Moscow 119991, Russia.
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- Belakovskiy, Dmitry, I (author)
- Russian Acad Sci, Fersman Mineral Museum, Leninsky Prospekt 18-2, Moscow 119071, Russia.
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- Vigasina, Marina F. (author)
- Moscow MV Lomonosov State Univ, Fac Geol, Moscow 119991, Russia.
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- Zubkova, Natalia, V (author)
- Moscow MV Lomonosov State Univ, Fac Geol, Moscow 119991, Russia.
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- Van, Konstantin V. (author)
- RAS, Inst Expt Mineral, Chernogolovka 142432, Russia.
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- Britvin, Sergey N. (author)
- St Petersburg State Univ, Dept Crystallog, Univ Skaya Nab 7-9, St Petersburg 199034, Russia.
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Russian Acad Sci, Inst Volcanol & Seismol, Buivar Piypa 9, Petropavlovsk Kamchatski 683006, Russia Russian Acad Sci, Inst Problems Chem Phys, Akad Semenova 1, Chernogolovka 142432, Russia. (creator_code:org_t)
- 2021-09-02
- 2021
- English.
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In: Mineralogical magazine. - : Mineralogical Society. - 0026-461X .- 1471-8022. ; 85:5, s. 817-826
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Abstract
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- The new wermlandite-group mineral erssonite, ideally CaMg7Fe23+(OH)(18)(SO4)(2)center dot 12H(2)O (or [Mg7Fe23+(OH)(18)][Ca(SO4)(2)].12H(2)O), was discovered in a late-stage, low-temperature assemblage in cavities of a magnetite-bearing dolomitic rock from the Langban deposit, Varmland county, Bergslagen ore province, Sweden. The associated minerals are dolomite, calcite, members of the magnetite-magnesioferrite solid-solution series, phlogopite, chrysotile, pyroaurite and norbergite. Erssonite has a vitreous lustre and forms colourless, platy hexagonal crystals flattened on [0001], up to 0.5 mm across and up to 10 mu m thick, occurring mainly as aggregates in cavities of dolomitic rock. Erssonite is malleable; separate crystals are flexible and non-elastic, with a perfect, mica-like cleavage on {0001}. The calculated density is equal to 2.02 g.cm(-3). Raman spectroscopy shows the presence of typical bands for S-O bonds attributed to intercalated SO42- anions and structural OH- anions together with the absence of C-O bonds, attributed to carbonate anions. The chemical composition is (wt.%, electron microprobe, H2O content is calculated from structure data): MgO 28.67, CaO 2.76, Al2O3 0.23, Cr2O3 0.23, Fe2O3 16.00, SiO2 0.48, SO3 14.80, H2O 35.58, total 98.75. The empirical formula based on 38 O atoms is H41.48Ca0.52Mg7.47Fe2.113+Al0.05Cr0.03S1.94Si0.08O38. The ideal formula is CaMg7Fe23+(OH)(18)(SO4)(2).12H(2)O or {Mg7Fe23+(OH)(18)}{[Ca(H2O)(6)] (SO4)(2)(H2O)(6)}. The crystal structure was determined using single-crystal X-ray diffraction data and refined to R = 0.093. Erssonite is trigonal, P (3) over bar c1, with a = 9.3550(6), c = 22.5462(14) angstrom, V = 1708.8(2) angstrom(3) and Z = 2. The strongest lines of the powder X-ray diffraction pattern [d, angstrom (I, %)(hkl)] are: 11.22 (90)(002), 5.63 (64)(004), 4.670 (100)(110, 104, 014), 2.626 (64)(032, 302), 2.435 (66)(034, 304) and 1.951 (45)(038, 308). The mineral is named in honour of the Swedish amateur mineralogist Dr. Anders Ersson (b. 1971).
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- erssonite
- new mineral
- wermlandite group
- hydrotalcite supergroup
- crystal structure
- IR spectroscopy
- Raman spectroscopy
- Langban mine
- Bergslagen ore province
Publication and Content Type
- ref (subject category)
- art (subject category)
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Zhitova, Elena S ...
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Chukanov, Nikita ...
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Jonsson, Erik, 1 ...
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Pekov, Igor, V
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Belakovskiy, Dmi ...
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Vigasina, Marina ...
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Zubkova, Natalia ...
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Van, Konstantin ...
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Britvin, Sergey ...
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and Geochemistry
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and Geology
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Mineralogical ma ...
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Uppsala University