The ideal formula for flurlite has been revised to Zn4Fe3+(PO4)3(OH)2(H2O)7·2H2O and its Mn analogue, manganflurlite (IMA2017-076), ZnFe3+(PO4)3(OH)2(H2O)7·2H2O has been found on two specimens of phosphophyllite from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany. Manganflurlite occurs as long, very thin, rectangular laths, up to 0.5 mm long and less than 10 μm thick. Laths are elongated on [100], flattened on {001} and exhibit the forms {1 0 0}, {0 1 0} and {0 0 1}. The mineral is orange brown in colour and transparent with a vitreous iridescent lustre and buff streak. Crystals are flexible and elastic with irregular fracture, and three cleavages: perfect on {0 0 1}, good on {1 0 0} and {0 1 0}. The Mohs’ hardness is ca. 2½. The measured density is 2.73(2) g cm−3. At room temperature, the mineral dissolves rapidly in dilute HCl. Optically, manganflurlite is biaxial (–), with α = 1.623(calc), β = 1.649(2), γ = 1.673(2) (white light); 2V = 86(1)°. The dispersion is r > v, slight; the optical orientation is X = c, Y = b, Z = a. The pleochroism is X = pale yellow brown, Y = orange brown, Z = light yellow brown, Y > Z > X. Electron microprobe analyses for crystals from the holotype specimen gave the empirical formula Zn(Zn0.68Mg0.08)Σ2.96(Al0.05)Σ1.00(PO4)3(OH)1.92(H2O)9.08. Manganflurlite is monoclinic, P21/m, a = 6.4546(8), b = 11.1502(9), c = 13.1630(10) Å, β = 99.829(5)°, V = 933.44(16) Å3 and Z = 2. The crystal structure, refined including all protons to Robs = 0.034 for 2219 observed reflections [I > 3σI], shows the mineral to be isostructural with flurlite. These minerals have a heteropolyhedral layer structure that is a topological isomer of the schoonerite structure.
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Research Article|
January 01, 2019
Manganflurlite, ZnMn32+Fe3+(PO4)3(OH)2(H2O)7·2H2O, a new schoonerite-related mineral from the Hagendorf-Süd pegmatite
Anthony R. Kampf;
1
Mineral Sciences Department, Natural History Museum of Los Angeles County
, 900 Exposition Boulevard, Los Angeles, CA90007, USA
Corresponding author, e-mail: akampf@nhm.org
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Ian E. Grey;
Ian E. Grey
2
CSIRO Mineral Resources
, Private Bag 10, Clayton South, Victoria3169, Australia
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Colin M. MacRae;
Colin M. MacRae
2
CSIRO Mineral Resources
, Private Bag 10, Clayton South, Victoria3169, Australia
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Erich Keck
Erich Keck
3
Algunderweg 3
, 92694Etzenricht, Germany
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1
Mineral Sciences Department, Natural History Museum of Los Angeles County
, 900 Exposition Boulevard, Los Angeles, CA90007, USA
Ian E. Grey
2
CSIRO Mineral Resources
, Private Bag 10, Clayton South, Victoria3169, Australia
Colin M. MacRae
2
CSIRO Mineral Resources
, Private Bag 10, Clayton South, Victoria3169, Australia
Erich Keck
3
Algunderweg 3
, 92694Etzenricht, Germany
Corresponding author, e-mail: akampf@nhm.org
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
20 Apr 2018
Revision Received:
26 May 2018
Accepted:
02 Jun 2018
First Online:
13 Sep 2018
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2018 E. Schweizerbart’sche Verlagsbuchhandlung, 70176 Stuttgart, Germany
European Journal of Mineralogy (2019) 31 (1): 127–134.
Article history
Received:
20 Apr 2018
Revision Received:
26 May 2018
Accepted:
02 Jun 2018
First Online:
13 Sep 2018
Citation
Anthony R. Kampf, Ian E. Grey, Colin M. MacRae, Erich Keck; Manganflurlite, ZnFe3+(PO4)3(OH)2(H2O)7·2H2O, a new schoonerite-related mineral from the Hagendorf-Süd pegmatite. European Journal of Mineralogy 2019;; 31 (1): 127–134. doi: https://doi.org/10.1127/ejm/2018/0030-2793
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Index Terms/Descriptors
- Bavaria Germany
- cell dimensions
- Central Europe
- chemical composition
- crystal form
- crystal structure
- crystal systems
- electron microscopy data
- electron probe data
- Europe
- formula
- Germany
- granites
- holotypes
- igneous rocks
- mineral cleavage
- monoclinic system
- new minerals
- optical properties
- pegmatite
- phosphates
- physical properties
- pleochroism
- plutonic rocks
- SEM data
- Upper Palatinate
- schoonerite
- Hagendorf-Sud Pegmatite
- flurlite
- manganflurlite
Latitude & Longitude
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