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- W4361004823 abstract "Abstract. Pleysteinite, [(H2O)0.5K0.5]2Mn2Al3(PO4)4F2(H2O)10 ⚫ 4H2O, is the aluminium analogue of benyacarite, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany. It was found in specimens of altered zwieselite, in association with nordgauite, fluellite, rockbridgeite, pyrite and columbite. Pleysteinite occurs as isolated and small aggregates of colourless, stubby prisms that are typically 10 to 30 µm wide and up to 100 µm long. The crystals are flattened on {010} and bounded by {111}, {100} and {001} planes. The calculated density is 2.34 g cm−3. Optically, pleysteinite crystals are biaxial (+), with α=1.566(2), β=1.580(2), γ=1.600(2) (measured in white light) and 2V(meas.) = 80(1)∘. The empirical formula from electron microprobe analyses and structure refinement is [(H2O)0.50K0.50]2(Mn1.20Mg0.49Fe0.272+Zn0.05)∑2.01(Al1.63Fe0.203+Ti0.194+)∑2.02(Al0.56Ti0.444+) (PO4)4.02[F0.58O0.31(OH)0.11]2(H2O)10 ⚫ 3.92H2O. Pleysteinite has orthorhombic symmetry, with space group Pbca and unit-cell parameters a = 10.4133(8) Å, b=20.5242(17) Å, c=12.2651(13) Å, V=2621.4(4) Å3 and Z=4. The crystal structure was refined using single-crystal data to wRobs=0.054 for 1692 reflections with I>3σ(I). The crystal structure contains corner-connected linear trimers of Al-centred octahedra that share corners with PO4 tetrahedra to form 10-member rings parallel to (010). K+ cations and water molecules are located in the rings. Additional corner-sharing of the PO4 tetrahedra with Mn(H2O)4O2 octahedra occurs along [010] to complete the 3D framework structure." @default.
- W4361004823 created "2023-03-30" @default.
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- W4361004823 date "2023-03-27" @default.
- W4361004823 modified "2023-10-09" @default.
- W4361004823 title "Pleysteinite, [(H<sub>2</sub>O)<sub>0.5</sub>K<sub>0.5</sub>]<sub>2</sub>Mn<sub>2</sub>Al<sub>3</sub>(PO<sub>4</sub>)<sub>4</sub>F<sub>2</sub>(H<sub>2</sub>O)<sub>10</sub> ⋅ 4H<sub>2</sub>O, the Al analogue of benyacarite, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany" @default.
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- W4361004823 doi "https://doi.org/10.5194/ejm-35-189-2023" @default.
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