RINMANITE, Zn2Sb2Mg2Fe4O14(OH)2, A NEW MINERAL SPECIES WITH A NOLANITE-TYPE STRUCTURE FROM THE GARPENBERG NORRA MINE, DALARNA, SWEDEN

Holtstam, Dan; Gatedal, Kjell; Söderberg, Karin; Norrestam, R.

doi:10.2113/gscanmin.39.6.1675

Cited by 11 publications

(7 citation statements)

References 14 publications

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“…The sulphide ores, dominated by sphalerite, galena and pyrite, form lenses and veinlets in close association with dolomite marble and silicate skarns (Sandecki, 1983). Over the last 5 years some 20 species new to the deposit, and two new to science (rambergite; Kalinowski, 1996, and rinmanite;Holtstam et al, 2001), have been brought to light. Notable nds include alleghanyite, franklinite, harmotome, native Pb, magnussonite, manganosite, melanotekite, pyroxmangite, pyrargyrite, roméite, samsonite, wenkite, willemite, yeatmanite and zincite.…”

Section: Occurrence and Paragenesismentioning

confidence: 99%

Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement

Kolitsch¹,

Holtstam²

2002

Mineral. mag.

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A new occurrence of barysilite, PbxMn(Si207h, at the polymetallic Garpenberg Norra Zn-Pb deposit, Hedemora. Dalarna, Sweden, is described. The mineral, which forms colourless, transparent grains, is characterized by X-ray diffraction and electron-microprobe analyses. The assemblage includes tephroite, zincian jacobsite, manganoan diopside and others. The crystal structure of a barysilite crystal from Garpenberg Norra was redetermined using single-crystal X-ray diflraction data (Mo-Kex, CCO area detector) and has been refined in space group R3c with a = 9.804( I), c = 38.416(8) A, V = 3197.8(8) A', to RI = 2.32% for 1025 'observed' reflections with Fo >4a(Fo)' A previous, lowprecision structure determination (Lajzerowicz, 1965; R = 20%) is confirmed but improved considerably.The structure contains one dist011ed MnO(, polyhedron with six equivalent Mn-O bonds (2.224 A), one Si207 disilicate unit with an Si-O-Si angle of 120.9', and two non-equivalent Pb sites. The Pb I site has a highly irregular, one-sided coordination with six 0 ligands, indicating a stereoactive 6.1'2lone-electron pair on the Pb2-ion, whereas the [6+ 3]-coordinated Pb2 site is fairly regular, with Pb-O distances of 2.540 (3 x), 2.674 (3 x) and 3.098 (3 x ) A.. The Pb2 site contains -10% of Ca (+Ba) replacing Pb, corresponding to the structural formula Pb 16(Pb,Ca)22Mn(Si207h. This is the first direct proof that not only the M site in barysilite-type PbxM(Si207 h compounds can be replaced by divalent cations.

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Section: Occurrence and Paragenesismentioning

confidence: 99%

Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement

Kolitsch¹,

Holtstam²

2002

Mineral. mag.

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“…Atoms, site occupancy factors (sof), fractional atomic coordinates and equivalent isotropic displacement parameters (Å 2 ) for the selected monteneveite crystal. from literature: 1.9647 Å in roméite (Matsubara et al, 1996), 1.960-1.983 Å in ingersonite (Bonazzi and Bindi, 2007), 1.958 Å in filipstadite (Bonazzi et al, 2013) and 1.971-2.022 Å in rinmanite (Holtstam et al, 2001). Due to the very large volume of the tetrahedron, the X dodecahedron (which shares two edges with it) shows a mean distance (2.490 Å) much larger than that observed, for example, in andradite (2.425 Å, X = Ca, Z = Si 3 ; Hazen and Finger, 1989), or even in schorlomite (2.440 Å, X = Ca, Z = Si 2.35 Fe 3+ 0.34 Fe 2+ 0.31 ; Peterson et al, 1995).…”

Section: Crystal Chemistrymentioning

confidence: 91%

Adding complexity to the garnet supergroup: monteneveite, Ca3Sb5+2(Fe3+2Fe2+)O12, a new mineral from the Monteneve mine, Bolzano Province, Italy

et al. 2020

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Abstract. Monteneveite, ideally Ca3Sb25+(Fe23+Fe2+)O12, is a new member of the garnet supergroup (IMA 2018-060). The mineral was discovered in a small specimen belonging to the Swedish Museum of Natural History coming from the now abandoned Monteneve Pb–Zn mine in Passiria Valley, Bolzano Province, Alto Adige (South Tyrol), Italy. The specimen consists of mainly magnetite, sphalerite, tetrahedrite-(Fe) and oxycalcioroméite. Monteneveite occurs as black, subhedral crystals with adamantine lustre. They are equidimensional and up to 400 µm in size, with a subconchoidal fracture. Monteneveite is opaque, grey in reflected light, and isotropic under crossed polars. Measured reflectance values (%) at the four COM wavelengths are 12.6 (470 nm), 12.0 (546 nm), 11.6 (589 nm) and 11.4 (650 nm). The Vickers hardness (VHN100) is 1141 kg mm−2, corresponding to H=6.5–7, and the calculated density is 4.72(1) g cm−3. A mean of 10 electron microprobe analyses gave (wt %) CaO 23.67, FeO 3.75, Fe2O3 29.54, Sb2O5 39.81, SnO2 2.22, ZnO 2.29, MgO 0.15, MnO 0.03 and CoO 0.03. The crystal chemical formula calculated on the basis of a total of eight cations and 12 anions, and taking into account the available structural and spectroscopic data, is (Ca2.97Mg0.03)Σ=3.00 (Sb1.735+Sn0.104+Fe0.173+)Σ=2.00(Fe2.433+Fe0.372+Zn0.20)Σ=3.00O12. The most significant chemical variations encountered in the sample are related to a substitution of the type YSn4++ZFe3+→YSb5++ZFe2+. Mössbauer data obtained at RT and 77 K indicate the presence of tetrahedrally coordinated Fe2+. Raman spectroscopy demonstrates that there is no measurable hydrogarnet component in monteneveite. The six strongest Bragg peaks in the powder X-ray diffraction pattern are [d (Å), I (%), (hkl)]: 4.45, 100, (220); 3.147, 60, (400); 2.814, 40, (420); 2.571, 80, (422); 1.993, 40, (620); 1.683, 60, (642). Monteneveite is cubic, space group Ia-3‾d, with a=12.6093(2) Å, V=2004.8(1) Å3, and Z=8. The crystal structure was refined up to R1=0.0197 for 305 reflections with Fo>4σ(Fo) and 19 parameters. Monteneveite is related to the other Ca-, Sb- and Fe-bearing, nominally Si-free members of the bitikleite group, but it differs in that it is the only known garnet species with mixed trivalent and divalent cations (2:1) at the tetrahedral Z site. Textural and mineralogical evidence suggests that monteneveite formed during peak metamorphism (at ca. 600 ∘C) during partial breakdown of tetrahedrite-(Fe) by reactions with carbonate, under relatively oxidizing conditions. The mineral is named after the type locality, the Monteneve (Schneeberg) mine.

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“…Reaphookhillite is a rare example of a non-silicate oxysalt mineral in which Mg and Zn are ordered in separate sites. Other structures that contain [6]-coordinated Mg sites and [4]-coordinated Zn sites are falsterite (Kampf et al, 2012), ferraioloite (Mills et al, 2016), rinmanite (Holtstam et al, 2001) and zemannite (Cametti et al, 2017;Missen et al, 2019). Gagné and Hawthorne (2015).…”

Section: Structural Relationsmentioning

confidence: 99%

Reaphookhillite, MgZn₂(PO₄)₂⋅4H₂O, the Mg analogue of parahopeite from Reaphook Hill, South Australia

Elliott

2022

MinMag

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Reaphookhillite, ideally MgZn2(PO4)2⋅4H2O, is a new phosphate mineral from Reaphook Hill, Flinders Ranges, South Australia, Australia. Reaphookhillite occurs as colourless, bladed to thin tabular crystals to 0.6 mm across. Cleavage is perfect parallel to {010}. The mineral occur as overgrowths on parahopeite crystals and is associated with scholzite, leucophosphite and chalcophanite. The calculated density is 3.09 g/cm3 from the empirical formula. Reaphookhillite is optically biaxial (+), α = 1.583(3), β = 1.596(3), γ = 1.611(3) and 2Vcalc = 88.7°. Electron microprobe analyses gave ZnO 41.57, MgO 7.96, MnO 0.40, P2O5 33.72, H2O(calc) 16.92, total 100.57 wt.%. The empirical formula, based on 12 O apfu, is Mg0.83Zn2.16Mn2+0.02(PO4)2.01⋅3.97H2O. Reaphookhillite is triclinic, P ${\bar 1}$ , with the unit-cell parameters of a = 5.7588(12), b = 7.5341(15) c = 5.2786(11) Å, α = 93.44(3), β = 91.27(3), γ = 91.30(3)°, V = 228.49(8) Å3 and Z = 1. The strongest eight lines in the powder X-ray diffraction pattern are [dobs in Å (I) (hkl)] 7.577 (100) (010); 4.461 (24) (01 ${\bar 1}$ ); 4.461 (24) (01 ${\bar 1}$ ); 3.771 (14) (020); 3.158 (13) (02 ${\bar 1}$ ); 2.982 (32) (021); 2.880 (27) (200); 2.775 (14) (1 ${\bar 2}$ 1, 12 ${\bar 1}$ ); and 2.668 (13) (1 ${\bar 2}{\bar 1}$ , 210). Reaphookhillite is isostructural with parahopeite, with Mg replacing Zn in the 6-coordinated site in the structure. The structure contains ZnO4 and PO4 tetrahedra which share corners to form a sheet in the (001) plane. Sheets are linked in the c direction by corner sharing MgO2(H2O)4 octahedra.

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RINMANITE, Zn2Sb2Mg2Fe4O14(OH)2, A NEW MINERAL SPECIES WITH A NOLANITE-TYPE STRUCTURE FROM THE GARPENBERG NORRA MINE, DALARNA, SWEDEN

Cited by 11 publications

References 14 publications

Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement

Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement

Adding complexity to the garnet supergroup: monteneveite, Ca<sub>3</sub>Sb<sup>5+</sup><sub>2</sub>(Fe<sup>3+</sup><sub>2</sub>Fe<sup>2+</sup>)O<sub>12</sub>, a new mineral from the Monteneve mine, Bolzano Province, Italy

Reaphookhillite, MgZn₂(PO₄)₂⋅4H₂O, the Mg analogue of parahopeite from Reaphook Hill, South Australia

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RINMANITE, Zn2Sb2Mg2Fe4O14(OH)2, A NEW MINERAL SPECIES WITH A NOLANITE-TYPE STRUCTURE FROM THE GARPENBERG NORRA MINE, DALARNA, SWEDEN

Cited by 11 publications

References 14 publications

Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement

Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement

Reaphookhillite, MgZn2(PO4)2⋅4H2O, the Mg analogue of parahopeite from Reaphook Hill, South Australia

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Reaphookhillite, MgZn₂(PO₄)₂⋅4H₂O, the Mg analogue of parahopeite from Reaphook Hill, South Australia