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Okruschite, Ca (sub 2) Mn (super 2+) (sub 5) Be (sub 4) (AsO (sub 4) ) (sub 6) (OH) (sub 4) . 6H (sub 2) O, a new roscherite-group mineral from Sailauf, Bavaria, Germany

Nikita V. Chukanov, Gerhard Mohn, Igor V. Pekov, Dmitry I. Belakovskiy, Yana V. Bychkova, Vladislav V. Gurzhiy and Joachim A. Lorenz
Okruschite, Ca (sub 2) Mn (super 2+) (sub 5) Be (sub 4) (AsO (sub 4) ) (sub 6) (OH) (sub 4) . 6H (sub 2) O, a new roscherite-group mineral from Sailauf, Bavaria, Germany
European Journal of Mineralogy (August 2014) 26 (4): 589-595

Abstract

The new mineral okruschite (IMA No. 2013-097), the arsenate analogue of roscherite, was discovered in a hydrothermal vein cross-cutting rhyolite exposed in the Fuchs quarry, near Sailauf, Spessart Mountains, Bavaria, Germany. Associated minerals are braunite, Mn-bearing calcite and arseniosiderite. Okruschite forms tabular aggregates up to 0.15 X 0.3 X 0.3 mm in size of curved and somewhat misaligned laths. It is white, semitransparent; lustre is vitreous. D (sub meas) =3.33(2), D (sub calc) =3.340 g/cm (super 3) . Okruschite is optically biaxial (-), alpha =1.671(3), beta =1.682(2), gamma =1.687(3), 2V (sub meas) =65(5) degrees . The infrared spectrum is given. The chemical composition is (electron microprobe, B and Li by ICP MS, H (sub 2) O by gas chromatography of ignition products, wt. %): Li (sub 2) O 0.04, BeO 7.70, MgO 1.68, CaO 8.28, MnO 16.27, FeO 4.89, Al (sub 2) O (sub 3) 0.22, As (sub 2) O (sub 5) 51.11, H (sub 2) O 11.0, total 101.19. The empirical formula based on 34 O atoms is: Ca (sub 1.99) (Mn (sub 3.09) Fe (sub 0.92) Mg (sub 0.56) Al (sub 0.06) Li (sub 0.04) ) (sub Sigma 4.67) Be (sub 4.15) (AsO (sub 4) ) (sub 5.99) (OH) (sub 3.64) .6.40H (sub 2) O. The simplified formula is Ca (sub 2) Mn (super 2+) (sub 5) Be (sub 4) (AsO (sub 4) ) (sub 6) (OH) (sub 4) .6H (sub 2) O. Okruschite is monoclinic, C2/c, a=16.33(4), b=12.03(3), c 6.93(1) Aa, beta 94.84(5) degrees , V=1357(4) Aa (super 3) , Z=2. The strongest lines of the powder X-ray diffraction pattern [d, Aa (I, %) (hkl)] are: 9.68 (39) (110), 4.95 (34) (310), 4.17 (34) (-311), 3.25 (100) (-202, 330), 3.11 (32) (-421), 2.841 (27) (240), 2.711 (26) (600), 1.726 (26) (461, -552, 004). Okruschite is named after Professor Martin Okrusch, from Germany. Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 26
Serial Issue: 4
Title: Okruschite, Ca (sub 2) Mn (super 2+) (sub 5) Be (sub 4) (AsO (sub 4) ) (sub 6) (OH) (sub 4) . 6H (sub 2) O, a new roscherite-group mineral from Sailauf, Bavaria, Germany
Affiliation: Russian Academy of Sciences, Institute of Problems of Chemical Physics, Chernogolovka, Russian Federation
Pages: 589-595
Published: 201408
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 25
Accession Number: 2014-082898
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
N50°02'01" - N50°02'01", E09°16'23" - E09°16'23"
Secondary Affiliation: Moscow State University, RUS, Russian FederationRussian Academy of Sciences, Fersman Mineralogical Museum, RUS, Russian FederationRussian Academy of Sciences, Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, RUS, Russian FederationSaint Petersburg State University, RUS, Russian Federation
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201443
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