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{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,9,16]],"date-time":"2024-09-16T16:09:02Z","timestamp":1726502942109},"reference-count":49,"publisher":"Mineralogical Society","issue":"1","license":[{"start":{"date-parts":[[2018,7,5]],"date-time":"2018-07-05T00:00:00Z","timestamp":1530748800000},"content-version":"unspecified","delay-in-days":5268,"URL":"https:\/\/www.cambridge.org\\/core\\/terms"}\],"content-domain":{"domain":\[\],"crossmark-restriction":false},"short-container-title":\["Mineral. mag."],"published-print":{"date-parts":[[2004,2]]},"abstract":"Abstract<\/jats:title>The hydrous calcium carbonate mineral ikaite (CaCO3<\/jats:sub>.6H2<\/jats:sub>O) forms in nature at low temperature in carbonate- and Ca-rich waters. Ikaite crystallizes in the spacegroup C2\/c<\/jats:italic>, and consists of CaCO3<\/jats:sub>.6H2<\/jats:sub>O units with Ca ions coordinated by eight oxygens, six from H2<\/jats:sub>O and two from the carbonate group. Hydrogen bonding links CaCO3<\/jats:sub>.6H2<\/jats:sub>O moieties to form the crystal structure.<\/jats:p>We have used synchrotron X-ray powder diffraction at T<\/jats:italic> = 243 K to refine the monoclinic structure of ikaite, and have measured unit-cell parameters of ikaite between T<\/jats:italic> = 114 K and T<\/jats:italic> = 293 K. Anisotropic thermal expansion in ikaite is evident, with the smallest relative increase occurring along the b<\/jats:italic> direction parallel to 2-fold axes. The contribution of hydrogen bonding to thermal expansion is assessed by comparison of our data with previously published data for deuterated ikaite, ice and gypsum. Ikaite exhibits a coefficient of volume expansion intermediate between that of ice (Ih) and of deuterated gypsum (CaSO4<\/jats:sub>.2D2<\/jats:sub>O) between T<\/jats:italic> = 114 K and T<\/jats:italic> = 293 K.<\/jats:p>","DOI":"10.1180\/0026461046810176","type":"journal-article","created":{"date-parts":[[2004,8,28]],"date-time":"2004-08-28T03:27:07Z","timestamp":1093663627000},"page":"135-146","source":"Crossref","is-referenced-by-count":30,"title":["The structure and thermal expansion behaviour of ikaite, CaCO3<\/sub>. 6H2<\/sub>O, from T<\/i> = 114 to T<\/i> = 293 K"],"prefix":"10.1180","volume":"68","author":[{"given":"A. R.","family":"Lennie","sequence":"first","affiliation":[]},{"given":"C. C.","family":"Tang","sequence":"additional","affiliation":[]},{"given":"S. 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(1971) Ikaite (CaCO3.6H2O), a phase more stable than calcite and aragonite (CaCO3) at high water pressure. 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