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Qatranaite, CaZn (sub 2) (OH) (sub 6) .2H (sub 2) O; a new mineral from altered pyrometamorphic rocks of the Hatrurim Complex, Daba-Siwaqa, Jordan

Yevgeny Vapnik, Evgeny V. Galuskin, Irina O. Galuskina, Joachim Kusz, Marta Stasiak, Tomasz Krzykawski and Mateusz Dulski
Qatranaite, CaZn (sub 2) (OH) (sub 6) .2H (sub 2) O; a new mineral from altered pyrometamorphic rocks of the Hatrurim Complex, Daba-Siwaqa, Jordan
European Journal of Mineralogy (January 2019) 31 (3): 575-584

Abstract

The new mineral qatranaite, CaZn (sub 2) (OH) (sub 6) .2H (sub 2) O (P2 (sub 1) /c, Z=2, a=6.3889(8) Aa, b=10.9692(14) Aa, c=5.7588(8) Aa; beta =101.949(14) degrees , V=394.84(9) Aa (super 3) ; IMA2016-024), was found in cuspidine veins cutting spurrite marble in part of the pyrometamorphic Hatrurim Complex located in the Siwaqa region, Jordan. Qatranaite is the natural counterpart of synthetic calcium hexahydroxodizincate dihydrate. It forms colourless or white crystals up to 0.3 mm in size. Qatranaite is associated with cuspidine, sphalerite, Se-bearing thaumasite, afwillite, calcite, srebrodolskite-brownmillerite, spinel-magnesioferrite, spurrite and fluorapatite-fluorellestadite. The new mineral has an irregular fracture; no cleavage or parting were observed. The calculated density of qatranaite is 2.598 g cm (super 3) , the microhardness VHN (sub 25) =171 kg mm (super -2) corresponds to approximately 3.5 in the Mohs' hardness scale. The qatranaite structure is formed by hydroxylated pyroxene-like chains [Zn (sub 2) (OH) (sub 6) ] (super 2-) , between which the [Ca(OH (sub 2) ) (sub 2) ] (super 2+) groups are located. The Ca atoms are eight-fold coordinated in [Ca(OH) (sub 4) (OH (sub 2) ) (sub 2) ] polyhedra which share the four hydroxyl oxygen atoms with the Zn-centred tetrahedra. The main bands in the Raman spectrum of qatranaite are related to vibrations in Zn(OH) (sub 4) (super 2-) tetrahedra (cm (super -1) ): 297,344 (v (sub 2) +v (sub 4) ); 440,449,479 (v (sub 1) +v (sub 3) ); 990 (vZn-O-Zn); 1065 (vZn-OH). Strong bands at 3190, 3497 and 3624 cm (super -1) are assigned to OH stretching vibrations. The strongest diffraction lines are [d (sub hkl) , Aa(I)]: 6.25 (33), 5.002 (14), 3.992 (23), 3.124 (47), 2.881 (100), 2.723 (28), 2.451 (12), 1.575 (20). Qatranaite crystallization was preceded by a high-temperature alteration of spurrite rocks, reflected in the formation of cuspidine along fractures. The formation of qatranaite-bearing veins resulted from low-temperature (<70 degrees C) rock alteration by hyper-alkaline solutions.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 31
Serial Issue: 3
Title: Qatranaite, CaZn (sub 2) (OH) (sub 6) .2H (sub 2) O; a new mineral from altered pyrometamorphic rocks of the Hatrurim Complex, Daba-Siwaqa, Jordan
Affiliation: Ben-Gurion University of the Negev, Department of Geological and Environmental Sciences, Bear-Sheva, Israel
Pages: 575-584
Published: 20190129
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 52
Accession Number: 2019-016976
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N31°24'23" - N31°24'23", E36°15'06" - E36°15'06"
Secondary Affiliation: University of Silesia, POL, PolandInstitute of Material Science, POL, Poland
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: 201911
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