ALKALI SULFATES WITH APHTHITALITE-LIKE STRUCTURES FROM FUMAROLES OF THE TOLBACHIK VOLCANO, KAMCHATKA, RUSSIA. I. METATHENARDITE, A NATURAL HIGH- TEMPERATURE MODIFICATION OF Na2SO4

被引：14

作者：

Pekov, Igor, V ^{[1
]}

Shchipalkina, Nadezhda, V ^{[1
]}

Zubkova, Natalia, V ^{[1
]}

Gurzhiy, Vladislav V. ^{[2
]}

Agakhanov, Atali A. ^{[3
]}

Belakovskiy, Dmitry, I ^{[3
]}

Chukanov, Nikita, V ^{[4
]}

Lykova, Irma S. ^{[1
,5
]}

Vigasina, Marina F. ^{[1
]}

Koshlyakova, Natalia N. ^{[1
]}

Sidorov, Evgeny G. ^{[6
]}

Giester, Gerald ^{[7
]}

机构：

[1] Moscow MV Lomonosov State Univ, Fac Geol, Moscow 119991, Russia

[2] St Petersburg State Univ, Dept Crystallog, Univ Skaya Nab 7-9, St Petersburg 199034, Russia

[3] Russian Acad Sci, Fersman Mineral Museum, Leninskiy Prospekt 18-2, Moscow 119071, Russia

[4] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Region, Russia

[5] Canadian Museum Nat, 240 McLeod St, Ottawa, ON K2P 2R1, Canada

[6] Russian Acad Sci, Far Eastern Branch, Inst Volcanol & Seismol, Piip Blvd 9, Petropavlovsk Kamchatski 683006, Russia

[7] Univ Vienna, Dept Mineral & Crystallog, Althanstr 14, A-1090 Vienna, Austria

来源：

CANADIAN MINERALOGIST | 2019年 / 57卷 / 06期

基金：

俄罗斯科学基金会;

关键词：

metathenardite; new mineral; sodium sulfate; thenardite; aphthitalite group; crystal structure; fumarole; Tolbachik volcano; Kamchatka; CRYSTAL-CHEMISTRY; SODIUM-SULFATE; GLASERITE; CONDUCTIVITY; POLYMORPHISM; TRANSITIONS; PENINSULA;

D O I：

10.3749/canmin.1900050

中图分类号：

P57 [矿物学];

学科分类号：

070901 ;

摘要：

The mineral is transparent to semitransparent, colorless, white, light-blue, greenish, yellowish, grayish or brownish, with vitreous luster. D-meas. = 2.72(1), D-calc. = 2.717 g/cm(3). Metathenardite is optically uniaxial (-), omega = 1.489(2), epsilon = 1.486(2). The empirical formulae are (Na1.92K0.05Ca0.02Zn0.01)[S0.99O4] (holotype), (Na1.54K0.22Ca0.09Cu0.01Mg0.01)[S1.00O4] (cotype 1), and Na1.65K0.11Ca0.05Cu0.04Mg0.01)[S1.01O4] (cotype 2). Admixed K and bivalent cations probably stabilize the hexagonal aphthitalite-like structure of metath ' enardite at room temperature. The crystal structure was solved using single crystals of all three samples, R-1 = 0.0852, 0.0452, and 0.0449 for holotype and cotypes 1 and 2, respectively. The space group is P6(3)/mmc, and the unit-cell parameters of the holotype are a = 5.3467(9), c = 7.0876(16) angstrom, V = 157.47(6) angstrom(3), and Z = 2. The strongest reflections of the powder X-ray diffraction pattern [d,angstrom (I)(hkl)] are: 4.667(27)(100), 3.904(89)(101), 3.565(33)(002), 2.824(94)(102), 2.686(100)(110), and 1.939(35)(202). Metathenardite and thenardite clearly differ from one another in X-ray diffraction data and infrared and Raman spectra.

引用

页码：885 / 901

页数：17

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