{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,9,16]],"date-time":"2024-09-16T14:14:06Z","timestamp":1726496046375},"reference-count":21,"publisher":"Mineralogical Society","issue":"4","license":[{"start":{"date-parts":[[2018,7,5]],"date-time":"2018-07-05T00:00:00Z","timestamp":1530748800000},"content-version":"unspecified","delay-in-days":2164,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Mineral. mag."],"published-print":{"date-parts":[[2012,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Tazzoliite, ideally Ba<jats:sub>2<\/jats:sub>CaSr<jats:sub>0.5<\/jats:sub>Na<jats:sub>0.5<\/jats:sub>Ti<jats:sub>2<\/jats:sub>Nb<jats:sub>3<\/jats:sub>SiO<jats:sub>17<\/jats:sub>[PO<jats:sub>2<\/jats:sub>(OH)<jats:sub>2<\/jats:sub>]<jats:sub>0.5<\/jats:sub>, is a new mineral (IMA 2011-018) from Monte delle Basse, Euganei Hills, Galzignano Terme, Padova, Italy. It occurs as lamellar  pale orange crystals, which are typically a few m m thick and up to 0.4 mm long, closely associated with a diopsidic pyroxene and titanite. Tazzoliite is transparent. It has a white streak, a pearly lustre, is not fluorescent and has a hardness of 6 (Mohs' scale). The tenacity is brittle and  the crystals have a perfect cleavage along {010}. The calculated density is 4.517 g cm<jats:sup>\u20133<\/jats:sup>. Tazzoliite is biaxial (\u2013) with 2V<jats:sub>meas<\/jats:sub> of ~50\u00ba, it is not pleochroic and the average refractive index is 2.04. No twinning was observed. Electronmicroprobe analyses  gave the following chemical formula: (Ba<jats:sub>1.93<\/jats:sub>Ca<jats:sub>1.20<\/jats:sub>Sr<jats:sub>0.52<\/jats:sub>Na<jats:sub>0.25<\/jats:sub>Fe<jats:sub>0.10<\/jats:sub><jats:sup>2+<\/jats:sup>)<jats:sub>\u03a34<\/jats:sub> (Nb<jats:sub>2.88<\/jats:sub>Ti<jats:sub>2.05<\/jats:sub>Ta<jats:sub>0.07<\/jats:sub>Zr<jats:sub>0.01<\/jats:sub>V<jats:sub>0.01<\/jats:sub><jats:sup>5+<\/jats:sup>)<jats:sub>\u03a35.02<\/jats:sub>SiO<jats:sub>17<\/jats:sub>[(P<jats:sub>0.13<\/jats:sub>Si<jats:sub>0.12<\/jats:sub>S<jats:sub>0.07<\/jats:sub>)<jats:sub>\u03a30.32<\/jats:sub>O<jats:sub>0.66<\/jats:sub>(OH)<jats:sub>0.66<\/jats:sub>][F<jats:sub>0.09<\/jats:sub>(OH)<jats:sub>0.23<\/jats:sub>]<jats:sub>\u03a30.32<\/jats:sub>.<\/jats:p><jats:p>Tazzoliite is orthorhombic, space group <jats:italic>Fmmm<\/jats:italic>, with unit-cell parameters <jats:italic>a<\/jats:italic> = 7.4116(3), <jats:italic>b<\/jats:italic> = 20.0632(8), <jats:italic>c<\/jats:italic> = 21.4402(8) \u00c5, <jats:italic>V<\/jats:italic> = 3188.2(2) \u00c53 and <jats:italic>Z<\/jats:italic> = 8. The crystal structure, obtained from single-crystal X-ray diffraction data,  was refined to <jats:italic>R<\/jats:italic><jats:sub>1<\/jats:sub>(<jats:italic>F<\/jats:italic><jats:sub>2<\/jats:sub>) = 0.063. It consists of a framework of Nb(Ti) octahedra and BaO<jats:sub>7<\/jats:sub> polyhedra sharing apexes or edges, and Si tetrahedra sharing apexes with Nb(Ti) octahedra and BaO<jats:sub>7<\/jats:sub> polyhedra. The structure, which is related to the pyrochlore  structure, contains three Nb(Ti) octahedra: two are Nb dominant and one is Ti dominant. Chains of <jats:italic>A<\/jats:italic>2O<jats:sub>8<\/jats:sub> polyhedra [<jats:italic>A<\/jats:italic>2 being occupied by Sr(Ca, Fe)] extend along [100] and are surrounded by Nb octahedra. Channels formed by six Nb(Ti) octahedra and two tetrahedra, or  four <jats:italic>A<\/jats:italic>1O<jats:sub>8<\/jats:sub>(OH) polyhedra (<jats:italic>A<\/jats:italic>1 being occupied by Ba), alternate along [100]. The channels are partially occupied by [PO<jats:sub>2<\/jats:sub>(OH)<jats:sub>2<\/jats:sub>] in two possible mutually exclusive positions, alternating with fully occupied <jats:italic>A<\/jats:italic>3O<jats:sub>7<\/jats:sub> polyhedral pairs [<jats:italic>A<\/jats:italic>3  being occupied by Ca(Na)]. The seven strongest X-ray powder diffraction lines [<jats:italic>d<\/jats:italic> in \u00c5 (<jats:italic>I<\/jats:italic>\/<jats:italic>I<\/jats:italic>0) (<jats:italic>hkl<\/jats:italic>)] are: 3.66 (60) (044), 3.16 (30) (153), 3.05 (100) (204), 2.98 (25) (240), 2.84 (50) (064), 1.85 (25) (400) and 1.82 (25) (268). Raman spectra of tazzoliite  were collected in the range 150\u20133700 cm<jats:sup>\u20131<\/jats:sup> and confirm the presence of OH groups. Tazzoliite is named in honour of Vittorio Tazzoli in recognition of his contributions to the fields of mineralogy and crystallography.<\/jats:p>","DOI":"10.1180\/minmag.2012.076.4.01","type":"journal-article","created":{"date-parts":[[2012,8,8]],"date-time":"2012-08-08T08:33:23Z","timestamp":1344414803000},"page":"827-838","source":"Crossref","is-referenced-by-count":2,"title":["Tazzoliite: a new mineral with a pyrochlore-related structure from the Euganei Hills, Padova, Italy"],"prefix":"10.1180","volume":"76","author":[{"given":"F.","family":"C\u00e1mara","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"F.","family":"Nestola","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"L.","family":"Bindi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A.","family":"Guastoni","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"F.","family":"Zorzi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"L.","family":"Peruzzo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"D.","family":"Pedron","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"7149","published-online":{"date-parts":[[2018,7,5]]},"reference":[{"key":"S0026461X00003662_ref22","first-page":"11","article-title":"La costituzione geologia dei Colli Euganei","volume":"51","author":"Dal Piaz","year":"1935","journal-title":"Atti e Memorie dell Accademia Patavina di Scienze, Lettere ed Arti"},{"key":"S0026461X00003662_ref34","first-page":"1372","article-title":"Crystal structure of girvasite","volume":"331","author":"Sokolova","year":"1990","journal-title":"Doklady Akadamii NaukSSSR"},{"key":"S0026461X00003662_ref27","doi-asserted-by":"publisher","DOI":"10.1016\/j.jssc.2006.12.024"},{"key":"S0026461X00003662_ref30","first-page":"5","article-title":"New data on komarovite series minerals","volume":"39","author":"Pekov","year":"2004","journal-title":"New Data on Minerals"},{"key":"S0026461X00003662_ref33","first-page":"112","author":"Sheldrick","year":"2008","journal-title":"SHELX. Acta Crystallographica"},{"key":"S0026461X00003662_ref21","doi-asserted-by":"publisher","DOI":"10.1016\/j.jssc.2005.11.031"},{"key":"S0026461X00003662_ref25","first-page":"417","article-title":"The structural chemistry of kalipyrochlore, a \u201chydropyr-ochlore\u201d","volume":"32","author":"Ercit","year":"1994","journal-title":"The Canadian Mineralogist"},{"volume-title":"La geologia dei Colli Euganei.","year":"2003","author":"Astolfi","key":"S0026461X00003662_ref18"},{"key":"S0026461X00003662_ref31","doi-asserted-by":"publisher","DOI":"10.1127\/ejm\/6\/4\/0503"},{"key":"S0026461X00003662_ref36","first-page":"342","article-title":"Kalksilikatgesteine bei Galzignano in den Euganeen","volume":"71","author":"Stark","year":"1936","journal-title":"Neues Jahrbuch fir Mineralogie, Geologie und Paldontologie"},{"key":"S0026461X00003662_ref35","doi-asserted-by":"publisher","DOI":"10.2113\/gscanmin.40.5.1421"},{"key":"S0026461X00003662_ref29","doi-asserted-by":"publisher","DOI":"10.1107\/S0021889807029238"},{"key":"S0026461X00003662_ref28","first-page":"498","article-title":"The Gladstone\u2014Dale relationship\u2014part I: derivation of new constants","volume":"14","author":"Mandarino","year":"1976","journal-title":"The Canadian Mineralogist"},{"key":"S0026461X00003662_ref19","doi-asserted-by":"publisher","DOI":"10.1127\/0028-3649\/2002\/2002-0497"},{"key":"S0026461X00003662_ref26","doi-asserted-by":"publisher","DOI":"10.1093\/acprof:oso\/9780199545698.001.0001"},{"key":"S0026461X00003662_ref32","doi-asserted-by":"publisher","DOI":"10.1107\/S0567739476001551"},{"key":"S0026461X00003662_ref20","doi-asserted-by":"publisher","DOI":"10.1524\/zkri.1970.131.1-6.278"},{"key":"S0026461X00003662_ref37","doi-asserted-by":"publisher","DOI":"10.1021\/jp0018807"},{"key":"S0026461X00003662_ref23","first-page":"1104","article-title":"Interactive software for calculating and displaying X-ray or neutron powder diffract-ometer patterns of crystalline materials","volume":"78","author":"Downs","year":"1993","journal-title":"American Mineralogist"},{"key":"S0026461X00003662_ref24","doi-asserted-by":"publisher","DOI":"10.1366\/0003702854248971"},{"key":"S0026461X00003662_ref17","doi-asserted-by":"publisher","DOI":"10.3749\/canmin.48.3.673"}],"container-title":["Mineralogical Magazine"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/S0026461X00003662","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,2,4]],"date-time":"2021-02-04T04:38:07Z","timestamp":1612413487000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.cambridge.org\/core\/product\/identifier\/S0026461X00003662\/type\/journal_article"},"secondary":[{"URL":"http:\/\/minmag.geoscienceworld.org\/cgi\/doi\/10.1180\/minmag.2012.076.4.01","label":"geoscienceworld"}]},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2012,8]]},"references-count":21,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2012,8]]}},"alternative-id":["S0026461X00003662"],"URL":"https:\/\/doi.org\/10.1180\/minmag.2012.076.4.01","relation":{},"ISSN":["0026-461X","1471-8022"],"issn-type":[{"type":"print","value":"0026-461X"},{"type":"electronic","value":"1471-8022"}],"subject":[],"published":{"date-parts":[[2012,8]]}}}