{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,2]],"date-time":"2026-03-02T23:00:25Z","timestamp":1772492425142,"version":"3.50.1"},"reference-count":19,"publisher":"Mineralogical Society","issue":"3","license":[{"start":{"date-parts":[[2018,7,5]],"date-time":"2018-07-05T00:00:00Z","timestamp":1530748800000},"content-version":"unspecified","delay-in-days":2225,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Mineral. mag."],"published-print":{"date-parts":[[2012,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The new mineral calciolangbeinite, ideally K<jats:sub>2<\/jats:sub>Ca<jats:sub>2<\/jats:sub>(SO<jats:sub>4<\/jats:sub>)<jats:sub>3<\/jats:sub>, is the Ca-dominant analogue of langbeinite. It occurs in sublimates at the Yadovitaya fumarole on the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure eruption,  Tolbachik volcano, Kamchatka, Russia. The mineral is associated with langbeinite, piypite, hematite, rutile, pseudobrookite, orthoclase, lyonsite, lammerite, cyanochroite and chlorothionite. Calciolangbeinite occurs as tetrahedral to pseudooctahedral crystals, which are bounded by {111} and  {11<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mime-subtype=\"png\" xlink:href=\"S0026461X00005612_inline1.png\"\/>}, and as anhedral grains up to 1 mm in size, aggregated into clusters up to 2 mm across, and forming crusts covering areas of up to 1.5x1.5 cm on the surface of volcanic scoria. Late-stage calciolangbeinite occurs in complex epitaxial intergrowths with langbeinite. Calciolangbeinite  is transparent and colourless with white streak and vitreous lustre. Its Mohs' hardness is 3\u20133\u00bd. It is brittle, has a conchoidal fracture and no obvious cleavage. The measured and calculated densities are <jats:italic>D<\/jats:italic><jats:sub>meas<\/jats:sub> = 2.68(2) and <jats:italic>D<\/jats:italic><jats:sub>calc<\/jats:sub> = 2.74 g cm<jats:sup>\u20133<\/jats:sup>, respectively. Calciolangbeinite is optically isotropic with n = 1.527(2). The chemical composition of the holotype specimen is Na<jats:sub>2<\/jats:sub>O 0.38, K<jats:sub>2<\/jats:sub>O 21.85, MgO 6.52, CaO 16.00, MnO 0.27, FeO 0.08, Al<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> 0.09, SO<jats:sub>3<\/jats:sub> 55.14, total 100.63 wt.%. The empirical formula, calculated on the basis of twelve oxygen atoms per formula unit, is K2.01(Ca<jats:sub>1.24<\/jats:sub>Mg<jats:sub>0.70<\/jats:sub>Na<jats:sub>0.05<\/jats:sub>Mn<jats:sub>0.02<\/jats:sub>Fe<jats:sub>0.01<\/jats:sub>Al<jats:sub>0.01<\/jats:sub>)S 2.03S<jats:sub>3.00<\/jats:sub>O<jats:sub>12<\/jats:sub>. Calciolangbeinite is cubic, space  group P2<jats:sub>1<\/jats:sub>3, a = 10.1887(4) \u00c5, V = 1057.68(4) \u00c53 and Z = 4. The strongest reflections in the X-ray powder pattern [listed as (d, \u00c5 (I)(hkl)] are 5.84(8)(111); 4.54(9)(120); 4.15(27)(211); 3.218 (100) (310,  130); 2.838 (8) (230, 320), 2.736 (37) (231, 321), 2.006 (11) (431, 341) , 1.658(8)(611,532,352). The crystal structure was refined from single-crystal X-ray diffraction data to R = 0.0447. The structure is based on the langbeinite-type three-dimensional complex framework, which is  made up of (Ca,Mg)O<jats:sub>6<\/jats:sub> octahedra (Ca and Mg are disordered) and SO<jats:sub>4<\/jats:sub> tetrahedra. Potassium atoms occupy two sites in voids in the framework; K(1) cations are located in ninefold polyhedra whereas K(2) cations are sited in significantly distorted octahedra. Calciolangbeinite  and langbeinite are isostructural and form a solid-solution series.<\/jats:p>","DOI":"10.1180\/minmag.2012.076.3.16","type":"journal-article","created":{"date-parts":[[2012,7,2]],"date-time":"2012-07-02T20:06:09Z","timestamp":1341259569000},"page":"673-682","source":"Crossref","is-referenced-by-count":13,"title":["Calciolangbeinite, K<sub>2<\/sub>Ca<sub>2<\/sub>(SO<sub>4<\/sub>)<sub>3<\/sub>, a new mineral from the Tolbachik volcano, Kamchatka, Russia"],"prefix":"10.1180","volume":"76","author":[{"given":"I. V.","family":"Pekov","sequence":"first","affiliation":[]},{"given":"M. E.","family":"Zelenski","sequence":"additional","affiliation":[]},{"given":"N. V.","family":"Zubkova","sequence":"additional","affiliation":[]},{"given":"V. O.","family":"Yapaskurt","sequence":"additional","affiliation":[]},{"given":"N. V.","family":"Chukanov","sequence":"additional","affiliation":[]},{"given":"D. I.","family":"Belakovskiy","sequence":"additional","affiliation":[]},{"given":"D. Y.","family":"Pushcharovsky","sequence":"additional","affiliation":[]}],"member":"7149","published-online":{"date-parts":[[2018,7,5]]},"reference":[{"key":"S0026461X00005612_ref443","first-page":"123","volume":"30","author":"Zambonini","year":"1924","journal-title":"Rendiconti della Regia Accademia delle Scienze Fisiche e Matematiche de Napoli"},{"key":"S0026461X00005612_ref427","volume-title":"Geological and Geophysical Data 1975-1976","author":"Fedotov","year":"1983"},{"key":"S0026461X00005612_ref431","doi-asserted-by":"crossref","first-page":"573","DOI":"10.3749\/canmin.47.3.573","article-title":"Condensate minerals from a burning coal-waste heap in Avion, Northern France. 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