{"id":2484,"date":"2016-02-28T16:40:21","date_gmt":"2016-02-28T16:40:21","guid":{"rendered":"http:\/\/webfe10.fe.cpd.local\/caribbeanlithos\/?p=2484"},"modified":"2026-03-04T15:35:32","modified_gmt":"2026-03-04T15:35:32","slug":"2016-ni-phyllosilicates-garnierites-from-the-falcondo-ni-laterite-deposit-dominican-republic-mineralogy-nanotextures-and-formation-mechanisms-by-hrtem-and-aem","status":"publish","type":"post","link":"https:\/\/caribbeanlithos.ub.edu\/?p=2484","title":{"rendered":"2016: Ni-phyllosilicates (garnierites) from the Falcondo Ni-laterite deposit (Dominican Republic): mineralogy, nanotextures and formation mechanisms by HRTEM and AEM"},"content":{"rendered":"<p><strong>Ni-phyllosilicates (garnierites) from the Falcondo Ni-laterite deposit (Dominican Republic): Mineralogy, nanotextures, and formation mechanisms by HRTEM and AEM<\/strong><\/p>\n<p><u>Abstract<\/u><\/p>\n<p>Ni-bearing magnesium phyllosilicates (garnierites) are significant Ni ores in Ni-laterites worldwide. The present paper reports a detailed TEM investigation of garnierites from the Falcondo Ni-laterite deposit (Dominican Republic). Different types of garnierites have been recognized, usually consisting of mixtures between serpentine and talc-like phases that display a wide range of textures at the nano-meter scale. In particular, chrysotile tubes, polygonal serpentine, and lizardite lamellae are intergrown with less crystalline, talc-like lamellae. Samples consisting uniquely of talc-like and of sepiolite-falcondoite were also observed, occurring as distinctive thin lamellae and long ribbon-shaped fibers, respectively. HRTEM imaging indicates that serpentine is replaced by the talc-like phase, whereas TEM-AEM data show preferential concentration of Ni in the talc-like phase. We suggest, therefore, that the crystallization of Ni-bearing phyllosilicates is associated with an increase in the silica activity of the system, promoting the replacement of the Ni-poor serpentine by the Ni-enriched talc-like phase. These results have interesting implications in material science, as garnierites are natural analogs of Ni-bearing phyllosilicate-supported synthetic catalysts. Finally, SAED and HRTEM suggest that the Ni-bearing talc-like phase corresponds to a variety of talc with extra water, showing larger d<sub>001<\/sub> than talc (i.e., 9.2\u20139.7 \u00c5), described as \u201ckerolite\u201d-\u201cpimelite\u201d in clay mineral literature.<\/p>\n<p><strong>Keywords:<\/strong> Ni-laterites; garnierites; chrysotile; polygonal serpentine; lizardite; \u201ckerolite\u201d-\u201cpimelite\u201d; sepiolite-falcondoite; HRTEM<\/p>\n<p>----------------------------------------------------------------------------------------------------------<\/p>\n<p><strong>To Cite this article:<\/strong> Villanova-de-Benavent, C., Nieto, F., Viti, C., Proenza, .J.A., Gal\u00ed, S., Roqu\u00e9-Rosell, J. (2016): Ni-phyllosilicates (garnierites) from the Falcondo Ni-laterite deposit (Dominican Republic): Mineralogy, nanotextures, and formation mechanisms by HRTEM and AEM. <em>American Mineralogist<\/em>, 101, 1460-1473.<\/p>\n<p><strong>DOI<\/strong>: <a href=\"http:\/\/ammin.geoscienceworld.org\/content\/101\/6\/1460\">10.2138\/am-2016-5518<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Ni-phyllosilicates (garnierites) from the Falcondo Ni-laterite deposit (Dominican Republic): Mineralogy, nanotextures, and formation mechanisms by HRTEM and AEM Abstract Ni-bearing magnesium phyllosilicates (garnierites) are significant Ni ores in Ni-laterites worldwide. The present paper reports a detailed TEM investigation of garnierites from the Falcondo Ni-laterite deposit (Dominican Republic). Different types of garnierites have been recognized, usually consisting of mixtures between serpentine&nbsp;<a href=\"https:\/\/caribbeanlithos.ub.edu\/?p=2484\" class=\"read-more\">Continue Reading<\/a>","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51,42,44],"tags":[],"class_list":["post-2484","post","type-post","status-publish","format-standard","hentry","category-publications2016","category-dominicanrepublic","category-publications","cat-51-id","cat-42-id","cat-44-id"],"_links":{"self":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts\/2484","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2484"}],"version-history":[{"count":3,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts\/2484\/revisions"}],"predecessor-version":[{"id":2699,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts\/2484\/revisions\/2699"}],"wp:attachment":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2484"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2484"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2484"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}