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Manganflurlite, ZnMn (super 2+) (sub 3) Fe (super 3+) (PO (sub 4) ) (sub 3) (OH) (sub 2) (H (sub 2) O) (sub 7) .2H (sub 2) O, a new schoonerite-related mineral from the Hagendorf-Sud Pegmatite

Anthony R. Kampf, Ian Edward Grey, Colin M. MacRae and Erich Keck
Manganflurlite, ZnMn (super 2+) (sub 3) Fe (super 3+) (PO (sub 4) ) (sub 3) (OH) (sub 2) (H (sub 2) O) (sub 7) .2H (sub 2) O, a new schoonerite-related mineral from the Hagendorf-Sud Pegmatite
European Journal of Mineralogy (September 2018) 31 (1): 127-134

Abstract

The ideal formula for flurlite has been revised to Zn (sub 4) Fe (super 3+) (PO (sub 4) ) (sub 3) (OH) (sub 2) (H (sub 2) O) (sub 7) .2H (sub 2) O and its Mn analogue, manganflurlite (IMA2017-076), ZnMn (sub 3) (super 2+) Fe (super 3+) (PO (sub 4) ) (sub 3) (OH) (sub 2) (H (sub 2) O)7.2H (sub 2) O has been found on two specimens of phosphophyllite from the Hagendorf-Sud pegmatite, Oberpfalz, Bavaria, Germany. Manganflurlite occurs as long, very thin, rectangular laths, up to 0.5 mm long and less than 10 mu m 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. 21/2. 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 alpha = 1.623(calc), beta = 1.649(2), gamma = 1.673(2) (white light); 2V = 86(1) degrees . 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(Mn (sub 1.51) (super 2+) Fe (sub 0.69) (super 2+) Zn (sub 0.68) Mg (sub 0.08) ) (sub Sigma 2.96) (Fe (sub 0.95) (super 3+) Al (sub 0.0 5) ) (sub Sigma 1.00) ( PO (sub 4) ) (sub 3) (OH) (sub 1.92) (H (sub 2) O) (sub 9.08) . Manganflurlite is monoclinic, P21/m, a = 6.4546(8), b = 11.1502(9), c = 13.1630(10) Aa, beta = 99.829(5) degrees , V = 933.44(16) Aa (super 3) and Z = 2. The crystal structure, refined including all protons to Robs = 0.034 for 2219 observed reflections [I > 3sigma I], shows the mineral to be isostructural with flurlite. These minerals have a heteropolyhedral layer structure that is a topological isomer of the schoonerite structure.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 31
Serial Issue: 1
Title: Manganflurlite, ZnMn (super 2+) (sub 3) Fe (super 3+) (PO (sub 4) ) (sub 3) (OH) (sub 2) (H (sub 2) O) (sub 7) .2H (sub 2) O, a new schoonerite-related mineral from the Hagendorf-Sud Pegmatite
Affiliation: Natural History Museum of Los Angeles County, Mineral Sciences Department, Los Angeles, CA, United States
Pages: 127-134
Published: 20180913
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 11
Accession Number: 2018-099129
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 8 tables
N49°39'01" - N49°39'01", E12°27'35" - E12°27'35"
Secondary Affiliation: Commonwealth Scientific and Industrial Research Organisation, Mineral Resources, AUS, Australia
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201852
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