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Zinkgruvanite, Ba4M...
Zinkgruvanite, Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2, a new ericssonite-group mineral from the Zinkgruvan Zn-Pb-Ag-Cu deposit, Askersund, Örebro County, Sweden.
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- Cámara, Fernando, 1967- (författare)
- Dipartimento di Scienze della Terra “Ardito Desio”, Università degli Studi di Milano, Via Luigi Mangiagalli 34, 20133, Milan, Italy,Univ Milan, Dipartimento Sci Terra Ardito Desio, Via Luigi Mangiagalli 34, I-20133 Milan, Italy.
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- Holtstam, Dan, 1963- (författare)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Department of Geosciences, Swedish Museum of Natural History, Box 50007, 104 05 Stockholm, Sweden,Swedish Museum Nat Hist, Dept Geosci, Box 50007, S-10405 Stockholm, Sweden.
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- Jansson, Nils (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik,Luleå Univ Technol, Dept Civil Environm & Nat Resources Engn, S-97187 Luleå, Sweden.
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- Jonsson, Erik, 1967- (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Geol Survey Sweden, Dept Mineral Resources, Villavagen 18, S-75236 Uppsala, Sweden
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- Karlsson, Andreas (författare)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Department of Geosciences, Swedish Museum of Natural History, Box 50007, 104 05 Stockholm, Sweden,Swedish Museum Nat Hist, Dept Geosci, Box 50007, S-10405 Stockholm, Sweden.
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- Langhof, Jörgen, 1965- (författare)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Department of Geosciences, Swedish Museum of Natural History, Box 50007, 104 05 Stockholm, Sweden,Swedish Museum Nat Hist, Dept Geosci, Box 50007, S-10405 Stockholm, Sweden.
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- Majka, Jaroslaw (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Al Mickiewicza 30, PL-30059 Krakow, Poland.
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- Zetterqvist, Anders (författare)
- Zetterqvist Geokonsult AB, Kvarnbacksvagen 74, S-16874 Bromma, Sweden.
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Dipartimento di Scienze della Terra “Ardito Desio”, Università degli Studi di Milano, Via Luigi Mangiagalli 34, 20133, Milan, Italy Univ Milan, Dipartimento Sci Terra Ardito Desio, Via Luigi Mangiagalli 34, I-20133 Milan, Italy (creator_code:org_t)
- 2021-11-04
- 2021
- Engelska.
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Ingår i: European journal of mineralogy. - : Nicolaus Copernicus University Press. - 0935-1221 .- 1617-4011. ; 33:6, s. 659-673
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https://ejm.copernic...
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https://nrm.diva-por... (primary) (Raw object)
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https://ejm.copernic...
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https://doi.org/10.5...
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https://ltu.diva-por... (primary) (Raw object)
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.5...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Zinkgruvanite, ideally Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2, is a new member of the ericssonite group, found in Ba-rich drill core samples from a sphalerite+galena- and diopside-rich metatuffite succession from the Zinkgruvan mine, Örebro county, Sweden. Zinkgruvanite is associated with massive baryte, barytocalcite, diopside and minor witherite, cerchiaraite-(Al) and sulfide minerals. It occurs as subhedral to euhedral flattened and elongated crystals up to 4 mm. It is almost black, semi-opaque with a dark brown streak. The luster is vitreous to sub-adamantine on crystal faces, resinous on fractures. The mineral is brittle with an uneven fracture. VHN100 = 539 and HMohs ~4½. In thin fragments, it is reddish-black, translucent and optically biaxial (+), 2Vz > 70°. Pleochroism is strong, deep brown-red (E ⊥ {001} cleavage) to olive-pale brown. Chemical point analyses by WDS-EPMA together with iron valencies determined from Mössbauer spectroscopy, yielded the empirical formula (based on 26 O+OH+F+Cl anions): (Ba4.02Na0.03)Σ4.05(Mn1.79Fe2+1.56Fe3+0.42Mg0.14Ca0.10Ni0.01Zn0.01)Σ4.03 (Fe3+1.74Ti0.20Al0.06)Σ2.00Si4(S1.61Si0.32P0.07)Σ1.99O24(OH1.63Cl0.29F0.08)Σ2.00. The mineral is triclinic, space group P–1, with unit-cell parameters a = 5.3982(1) Å, b = 7.0237(1) Å, c = 14.8108(4) Å, α = 98.256(2)º, β = 93.379(2)º, γ = 89.985(2)º and V = 554.75(2) Å3 for Z = 1. The eight strongest X-ray powder diffraction lines are [d Å (I%; hkl)]: 3.508 (70; 103), 2.980(70; 11–4), 2.814 (68; 1–22), 2.777 (70; 121), 2.699 (714; 200), 2.680 (68; 20–1), 2.125 (100; 124, 204), 2.107 (96; –221). The crystal structure (R1 = 0.0379 for 3204 reflections) is an array of TS (titanium silicate) blocks alternating with intermediate blocks. The TS blocks consist of HOH sheets (H = heteropolyhedral, O = octahedral) parallel to (001). In the O sheet, the Mn2+-dominant MO(1,2,3) sites give ideally Mn2+4 pfu. In the H sheet, the Fe3+-dominant MH sites and AP(1) sites give ideally Fe3+2Ba2 pfu. In the intermediate block, SO4 oxyanions and eleven coordinated Ba atoms give ideally 2 × SO4Ba pfu. Zinkgruvanite is related to ericssonite and ferro-ericssonite in having the same topology and type of linkage of layers in the TS block. Zinkgruvanite is also closely compositionally related to yoshimuraite, Ba4Mn4Ti2(Si2O7)2(PO4)2O2(OH)2, via the coupled heterovalent substitution 2 Ti4+ + 2 (PO4)3- →2 Fe3+ + 2 (SO4)2-, but presents a different type of linkage. The new mineral probably formed during a late stage of regional metamorphism of a Ba-enriched, syngenetic protolith, involving locally generated oxidized fluids of high salinity.
Ämnesord
- 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)
Nyckelord
- zinkgruvanite
- new mineral
- mineral nomenclature
- ericssonite group
- Zinkgruvan
- barium mineralization
- skarn
- The changing Earth
- Den föränderliga jorden
- Ore Geology
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