{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,9,16]],"date-time":"2024-09-16T15:47:03Z","timestamp":1726501623436},"reference-count":28,"publisher":"Mineralogical Society","issue":"6","license":[{"start":{"date-parts":[[2018,7,5]],"date-time":"2018-07-05T00:00:00Z","timestamp":1530748800000},"content-version":"unspecified","delay-in-days":1799,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Mineral. mag."],"published-print":{"date-parts":[[2013,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>\u0160venekite (IMA 99-007), Ca[AsO<jats:sub>2<\/jats:sub>(OH)<jats:sub>2<\/jats:sub>]<jats:sub>2<\/jats:sub>, is a rare supergene arsenate mineral occurring in the Geschieber vein, J\u00e1chymov ore district, Western Bohemia, Czech Republic. It grows directly on the granite rocks and occurs isolated from other  arsenate minerals otherwise common in J\u00e1chymov. \u0160venekite usually forms clear transparent coatings composed of indistinct radiating to rosette-shaped aggregates up to 3 mm across. They are composed of thin lens- or bladed-shaped crystals, usually 100 \u2013 150 \u03bcm long. \u0160venekite  is transparent to translucent and has a white streak and a vitreous lustre; it does not fluoresce under ultraviolet light. Cleavage is very good on {010}. The Mohs hardness is \u223c2. \u0160venekite is biaxial, non-pleochroic. The refractive indices are \u03b1' = 1.602(2), \u03b3' = 1.658(2).  The empirical formula of \u0161venekite (based on As + P + S = 2 a.p.f.u., an average of 10 spot analyses) is (Ca<jats:sub>1.00<\/jats:sub>Mg<jats:sub>0.01<\/jats:sub>)<jats:sub>\u03a31.01<\/jats:sub>[AsO<jats:sub>2<\/jats:sub>(OH)<jats:sub>2<\/jats:sub>]<jats:sub>1.96<\/jats:sub>[PO<jats:sub>2<\/jats:sub>(OH)<jats:sub>2<\/jats:sub>]<jats:sub>0.03<\/jats:sub>(SO<jats:sub>4<\/jats:sub>)<jats:sub>0.01.<\/jats:sub>  The simplified formula is Ca[AsO<jats:sub>2<\/jats:sub>(OH)<jats:sub>2<\/jats:sub>]<jats:sub>2<\/jats:sub> and requires CaO 17.42, As<jats:sub>2<\/jats:sub>O<jats:sub>5<\/jats:sub>71.39, H<jats:sub>2<\/jats:sub>O 11.19, total 100.00 wt.%. Raman and infrared spectroscopy exhibit dominance of O \u2013 H vibrations and vibration modes of distorted tetrahedral  AsO<jats:sub>2<\/jats:sub>(OH)<jats:sub>2<\/jats:sub> units. \u0160venekite is triclinic, space group <jats:italic>P<\/jats:italic><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mime-subtype=\"png\" xlink:href=\"S0026461X00005211_inline01.png\"\/>, with <jats:italic>a<\/jats:italic> = 8.5606(5), <jats:italic>b<\/jats:italic> = 7.6926(6), <jats:italic>c<\/jats:italic> = 5.7206(4) \u00c5, <jats:italic>\u03b1<\/jats:italic> = 92.605(6), <jats:italic>\u03b2<\/jats:italic> = 109.9002(6), <jats:italic>\u03b3<\/jats:italic> = 109.9017(6)\u00ba, and <jats:italic>V<\/jats:italic> = 327.48(4) \u00c5<jats:sup>3<\/jats:sup>, <jats:italic>Z<\/jats:italic> = 2, D<jats:sub>calc<\/jats:sub> = 3.26 g\u00b7cm<jats:sup>\u20133<\/jats:sup>. The <jats:italic>a:b:c<\/jats:italic> ratio is 0.7436:1:1.1082 (for single-crystal data). The six strongest diffraction peaks in the X-ray powder diffraction pattern are [<jats:italic>d (\u00c5)\/I(%)\/(hkl)<\/jats:italic>]: 3.968(33)(2<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mime-subtype=\"png\" xlink:href=\"S0026461X00005211_inline01.png\"\/>0); 3.766(35)(2<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mime-subtype=\"png\" xlink:href=\"S0026461X00005211_inline01.png\"\/><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mime-subtype=\"png\" xlink:href=\"S0026461X00005211_inline01.png\"\/>); 3.697(49)(101); 3.554(100)(020);  3.259(33)(2<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mime-subtype=\"png\" xlink:href=\"S0026461X00005211_inline02.png\"\/>0); 3.097(49)(1<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mime-subtype=\"png\" xlink:href=\"S0026461X00005211_inline02.png\"\/>1). The crystal structure of \u0161venekite was refined from single-crystal X-ray diffraction data to <jats:italic>R<\/jats:italic><jats:sub>1<\/jats:sub> = 0.0250 based on 1309 unique observed, and to <jats:italic>wR<\/jats:italic><jats:sub>2<\/jats:sub> = 0.0588, for all 1588 unique reflections (with GOF<jats:sub>all<\/jats:sub> =  1.20). The structure of \u0161venekite consists of sheets of corner-sharing CaO<jats:sub>8<\/jats:sub> polyhedra and AsO<jats:sub>2<\/jats:sub> OH<jats:sub>2<\/jats:sub> groups, stacked parallel to (001). Adjacent sheets are linked by hydrogen bonds. The \u0161venekite structure possesses very short symmetrical hydrogen  bonds (with the <jats:italic>D<\/jats:italic>\u2013H lengths \u223c1.22 \u00c5). The mineral is named to honour Jaroslav \u0160venek, the former curator of the mineralogical collection of the National Museum in Prague, Czech Republic.<\/jats:p>","DOI":"10.1180\/minmag.2013.077.6.02","type":"journal-article","created":{"date-parts":[[2013,8,22]],"date-time":"2013-08-22T15:39:47Z","timestamp":1377185987000},"page":"2711-2724","source":"Crossref","is-referenced-by-count":6,"title":["\u0160venekite, Ca[AsO<sub>2<\/sub>(OH)<sub>2<\/sub>]<sub>2<\/sub>, a new mineral from J\u00e1chymov, Czech Republic"],"prefix":"10.1180","volume":"77","author":[{"given":"P.","family":"Ondru\u0161","sequence":"first","affiliation":[]},{"given":"R.","family":"Sk\u00e1la","sequence":"additional","affiliation":[]},{"given":"J.","family":"Pl\u00e1\u0161il","sequence":"additional","affiliation":[]},{"given":"J.","family":"Sejkora","sequence":"additional","affiliation":[]},{"given":"F.","family":"Veselovsk\u00fd","sequence":"additional","affiliation":[]},{"given":"J.","family":"\u010cejka","sequence":"additional","affiliation":[]},{"given":"A.","family":"Kallistov\u00e1","sequence":"additional","affiliation":[]},{"given":"J.","family":"Hlou\u0161ek","sequence":"additional","affiliation":[]},{"given":"K.","family":"Fejfarov\u00e1","sequence":"additional","affiliation":[]},{"given":"R.","family":"\u0160koda","sequence":"additional","affiliation":[]},{"given":"M.","family":"Du\u0161ek","sequence":"additional","affiliation":[]},{"given":"A.","family":"Gaba\u0161ov\u00e1","sequence":"additional","affiliation":[]},{"given":"V.","family":"Machovi\u010d","sequence":"additional","affiliation":[]},{"given":"L.","family":"Lap\u010d\u00e1k","sequence":"additional","affiliation":[]}],"member":"7149","published-online":{"date-parts":[[2018,7,5]]},"reference":[{"doi-asserted-by":"publisher","key":"S0026461X00005211_ref3","DOI":"10.1107\/S0567739473000689"},{"key":"S0026461X00005211_ref22","first-page":"104","volume-title":"Microbeam Analysis","author":"Pouchou","year":"1985"},{"key":"S0026461X00005211_ref19","first-page":"149","article-title":"Supplement to secondary and rock-forming minerals of the J\u00e1chymov ore district","volume":"48","author":"Ondru\u0161","year":"2003a","journal-title":"Journal of the Czech Geological Society"},{"doi-asserted-by":"publisher","key":"S0026461X00005211_ref1","DOI":"10.1107\/S0567740881006043"},{"unstructured":"Keller, P. 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