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>&thinsp; ⋅ &thinsp;4H<sub>2</sub>O, the Al analogue of benyacarite, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany

Abstract 2 O) 0.5 K0.5 ]2 Mn2 Al3 (PO4) 4 F2 (H2 O) 10  ⚫ 2 O, 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 µ m wide and up to 100 µ m long. The crystals are flattened on { 010 } and bounded by { 111 }, { 100 } and { 001 } planes. The calculated density is 2.34 g cm- 3 + α = 1.566 (2), β = 1.580 (2), γ = 1.600 (2) (measured in white light) and 2V = ∘. The empirical formula from electron microprobe analyses and structure refinement is [(H2 O) 0.50 K0.50 ]2 (Mn1.20 Mg0.49 Fe0.27 2 + Zn0.05)∑ 2.01 1.63 Fe0.20 3 + Ti0.19 4 +)∑ 2.02 0.56 Ti0.44 4 +) (PO4) 4.02 [F0.58 O0.31 (OH) 0.11 ]2 (H2 O) 10  ⚫ 2 O. Pleysteinite has orthorhombic symmetry, with space group Pbca a = 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 wR obs = 0.054 for 1692 reflections with I > 3 σ (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 (H2 O) 4 O2 octahedra occurs along [010] to complete the 3D framework structure.

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Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch

Erschienen in
Pleysteinite, ((H2O)0.5K0.5)2Mn2Al3(PO4)4F2(H2O)10  ⋅  4H2O, the Al analogue of benyacarite, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany ; volume:35 ; number:2 ; year:2023 ; pages:189-197 ; extent:9
European journal of mineralogy ; 35, Heft 2 (2023), 189-197 (gesamt 9)

Urheber
Grey, Ian E.
Hochleitner, Rupert
Rewitzer, Christian
Kampf, Anthony R.
MacRae, Colin M.
Gable, Robert W.
Mumme, William G.
Keck, Erich
Davidson, Cameron

DOI
10.5194/ejm-35-189-2023
URN
urn:nbn:de:101:1-2023033005182194836169
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
14.08.2025, 10:44 MESZ

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Beteiligte

  • Grey, Ian E.
  • Hochleitner, Rupert
  • Rewitzer, Christian
  • Kampf, Anthony R.
  • MacRae, Colin M.
  • Gable, Robert W.
  • Mumme, William G.
  • Keck, Erich
  • Davidson, Cameron

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