IMA 2021-016 = erssonite

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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IMA 2021-016 = erssonite

Messaggio da Marco E. Ciriotti » ven 03 set, 2021 14:08

Prossima pubblicazione.

Referenza:
▪ Zhitova, E.S., Chukanov, N.V., Jonsson, E., Pekov, I.V., Belakovskiy, D.I., Vigasina, M.F., Zubkova, N.V., Van, K.V., Britvin, S.N. (2021): Erssonite, CaMg7Fe3+2(OH)18(SO4)2⋅12H2O, a new hydrotalcite-supergroup mineral from Långban, Sweden. Mineralogical Magazine, 85, (in press).

Abstract:
The new wermlandite-group mineral erssonite, ideally CaMg7Fe3+2(OH)18(SO4)2·12H2O (or [Mg7Fe3+2(OH)18][Ca(SO4)2]·12H2O), was discovered in a late-stage, low-temperature assemblage in cavities of a magnetite-bearing dolomitic rock from the Långban deposit, Värmland 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 m thick, mainly occurring 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 S˗O bonds attributed to intercalated SO42- anions and structural OH- anions as well as the absence of C˗O bonds attributed 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 H41.48Ca0.52Mg7.47Fe3+2.11Al0.05Cr0.03S1.94Si0.08O38. The ideal formula is CaMg7Fe3+2(OH)18(SO4)2·12H2O or {Mg7Fe3+2(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–3c1, with a = 9.3550(6), c = 22.5462(14) Å, V = 1708.8(2) Å3 and Z = 2. The strongest lines of the powder X-ray diffraction pattern [d, Å (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), 1.951 (45) (038, 308). The mineral is named in honour of the Swedish amateur mineralogist Dr. Anders Ersson (b. 1971).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2021-016 = erssonite

Messaggio da Marco E. Ciriotti » gio 25 nov, 2021 15:08

Pubblicazione effettuata.

Referenza:
▪ Zhitova, E.S., Chukanov, N.V., Jonsson, E., Pekov, I.V., Belakovskiy, D.I., Vigasina, M.F., Zubkova, N.V., Van, K.V., Britvin, S.N. (2021): Erssonite, CaMg7Fe3+2(OH)18(SO4)2⋅12H2O, a new hydrotalcite-supergroup mineral from Långban, Sweden. Mineralogical Magazine, 85, 817-826.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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