| Reference Type | Journal (article/letter/editorial) |
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| Title | Maneckiite, ideally NaCa2Fe2+2(Fe3+Mg)Mn2(PO4)6(H2O)2, a new phosphate mineral of the wicksite supergroup from the Michałkowa pegmatite, Góry Sowie Block, southwestern Poland |
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| Journal | Mineralogical Magazine |
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| Authors | Pieczka, Adam | Author |
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| Hawthorne, Frank C. | Author |
| Gołębiowska, Bożena | Author |
| Włodek, Adam | Author |
| Grochowina, Anna | Author |
| Year | 2017 (June) | Volume | 81 |
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| Page(s) | 723-736 | Issue | 3 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/rruff_1.0/uploads/MM81_723.pdf+ |
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| DOI | doi:10.1180/minmag.2016.080.127Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 244906 | Long-form Identifier | mindat:1:5:244906:1 |
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| GUID | 988ce3f1-dd53-4523-8206-b75ddad273ac |
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| Full Reference | Pieczka, Adam, Hawthorne, Frank C., Gołębiowska, Bożena, Włodek, Adam, Grochowina, Anna (2017) Maneckiite, ideally NaCa2Fe2+2(Fe3+Mg)Mn2(PO4)6(H2O)2, a new phosphate mineral of the wicksite supergroup from the Michałkowa pegmatite, Góry Sowie Block, southwestern Poland. Mineralogical Magazine, 81 (3) 723-736 doi:10.1180/minmag.2016.080.127 |
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| Plain Text | Pieczka, Adam, Hawthorne, Frank C., Gołębiowska, Bożena, Włodek, Adam, Grochowina, Anna (2017) Maneckiite, ideally NaCa2Fe2+2(Fe3+Mg)Mn2(PO4)6(H2O)2, a new phosphate mineral of the wicksite supergroup from the Michałkowa pegmatite, Góry Sowie Block, southwestern Poland. Mineralogical Magazine, 81 (3) 723-736 doi:10.1180/minmag.2016.080.127 |
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| Abstract/Notes | Maneckiite, ideally NaCa2Fe22þ (Fe3+Mg)Mn2(PO4)6(H2O)2, was found in a pegmatite at Michałkowa, Góry Sowie Block, SW Poland. The mineral forms subhedral and anhedral crystals ~150 μm × 150 μm in the outer zone of phosphate nodules, where it is associated with fluorapatite, wolfeite, Ca-rich graftonite and alluaudite-group minerals. Maneckiite is transparent, dark brown, with a colourless streak and vitreous lustre, brittle, and has a good cleavage // {010}, a splintery fracture and a Mohs hardness of ~5. The calculated density is 3.531 g cm–3. Maneckiite is pleochroic: α = dark green, β = dark blue/green, γ = light brown/tan, biaxial (+) with refractive indices α = 1.698(2), β = 1.706(2), γ = 1.727(2) and birefringence Δ = ~0.03; 2Vmeas. = 65.9 (1.5)° and 2Vcalc. = 64°, dispersion is obscured by the dark colour, and optical orientation X//a, Y//b, Z//c. Maneckite is orthorhombic (Pcab) and has unit-cell parameters a = 12.526(4) Å, b = 12.914(5) Å, c = 11.664(4) Å and V = 1886.8(5) Å3. The strongest reflections are (dhkl in Å; I; hkl): 2.759, 100, 402; 2.916, 78, 004; 3.020, 68, 401; 2.844, 35, 014; 2.869, 31, 240; 2.825, 30, 042. Maneckiite has the wicksite structure and is its M(3)Mn-analogue. The mineral crystallized as a product of Na- and Ca-metasomatism induced by a HT fluid in the presence of Al3+ from a neighbouring aluminosilicate melt. A Gladstone-Dale index, 0.027, places maneckiite in the category ‘excellent’. |
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