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New zinc and potassium chlorides from fumaroles of the Tolbachik Volcano, Kamchatka, Russia; mineral data and crystal chemistry; II, Flinteite, K (sub 2) ZnCl (sub 4)

Igor V. Pekov, Natalia V. Zubkova, Vasiliy O. Yapaskurt, Sergey N. Britvin, Marina F. Vigasina, Evgeny G. Sidorov and Dmitry Yu. Pushcharovsky
New zinc and potassium chlorides from fumaroles of the Tolbachik Volcano, Kamchatka, Russia; mineral data and crystal chemistry; II, Flinteite, K (sub 2) ZnCl (sub 4)
European Journal of Mineralogy (May 2015) 27 (4): 581-588

Abstract

The new mineral flinteite, ideally K (sub 2) ZnCl (sub 4) , was discovered in active fumaroles at two scoria cones of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. In the Northern fumarole field at the First scoria cone (locality of the holotype), flinteite is a common mineral associated with halite, sellaite, fluorite, saltonseaite, chubarovite and hollandite. In the Arsenatnaya fumarole at the Second scoria cone, flinteite occurs with langbeinite, aphthitalite, fluoborite, sylvite, halite, tenorite, hematite, zincite, chubarovite, krasheninnikovite, vanthoffite, etc. In the Glavnaya Tenoritovaya fumarole (Second scoria cone), flinteite is associated with mellizinkalite, belloite, avdoninite, eriochalcite, sylvite, halite, mitscherlichite, sanguite, chrysothallite, romanorlovite, gypsum, chlorothionite, kainite, etc. Flinteite typically forms prismatic crystals up to 0.2X0.3X1.2 mm, their groups, granular aggregates or crusts up to 0.5X5X5 mm. The mineral is light green, light yellow to bright greenish-yellow or colourless. It is transparent, with vitreous lustre. Flinteite is brittle, one direction of distinct cleavage was observed. The Mohs hardness is ca. 2. D (sub calc) = 2.49 g cm (super -) (super 3) . Flinteite is optically biaxial (+), alpha = 1.573(1), beta = 1.574(1), gamma = 1.576(1), 2V (sub meas) = 40(25) degrees . The chemical composition of the holotype (wt%, electron-microprobe data) is: K 24.97, Tl 5.82, Co 0.07, Zn 22.23, Cl 46.95, total 100.04. The empirical formula calculated based on the sum of all atoms = 7 pfu is: (K (sub 1.91) Tl (sub 0.09) ) (sub Sigma 2.00) Zn (sub 1.04) Cl (sub 3.96) . Some samples show the following substitutions for K (wt%): up to 27.7 Tl, 0.6-2.4 Rb, 0.5-2.2 Cs. Flinteite is orthorhombic, Pna2 (sub 1) , a = 26.8090(10), b = 12.4085(6), c = 7.2512(3) Aa, V = 2412.18(18) Aa (super 3) and Z = 12. The strongest reflections of the powder X-ray diffraction pattern [d, Aa (I)(hkl)] are: 6.23(27)(011, 020), 5.123(88)(311, 320), 3.629(98)(611, 002), 3.599(100)(031), 3.133(35)(022), 3.039(26)(630), 2.897(35)(910) and 2.688(46)(911, 920). The crystal structure, solved from single-crystal X-ray diffraction data (R = 0.0686), contains three Zn sites centring isolated tetrahedra ZnCl (sub 4) and six independent K sites. Flinteite is the natural analogue of a well-known synthetic room-temperature modification of K (sub 2) ZnCl (sub 4) , a ferroelectric material. The mineral is named in honour of the Russian crystallographer Evgeniy E. Flint (1887-1975).


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 27
Serial Issue: 4
Title: New zinc and potassium chlorides from fumaroles of the Tolbachik Volcano, Kamchatka, Russia; mineral data and crystal chemistry; II, Flinteite, K (sub 2) ZnCl (sub 4)
Affiliation: Moscow State University, Moscow, Russian Federation
Pages: 581-588
Published: 20150504
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 24
Accession Number: 2015-049855
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N55°49'02" - N55°49'02", E160°22'02" - E160°22'02"
Secondary Affiliation: Saint Petersburg State University, RUS, Russian FederationRussian Academy of Sciences, Institute of Volcanology and Seismology, 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: 201523
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