LINK<\/strong><\/a><\/p>\n\n\n\n“Na\u2013Fe and Na\u2013Ca\u2013Mg\u2013Fe phosphates were found in the impact melt associations of the Chelyabinsk meteorite (Chebarkul fragment). They drastically differ in composition from phosphates of the initial chondrite (chlorapatite and merrillite). Chladniite Na2.25Ca2.14Mg6.47Fe3.76Mn0.17(PO4)9 and a merrillite-like phase Na1.32Ca6.80Mg2.07Fe0.98Mn0.04(PO4)7 were found in the silicate part in quenched interstitial groundmass between olivine grains; merrillite and chlorapatite are rare in it. The spongy metal\u2013sulfide aggregate in the large vugs and metal\u2013sulfide blebs in the silicate part contain Na\u2013Fe phosphate globules. They consist of sarcopside and graftonite (Fe2+,Mn2+)3(PO4)2, galileiite Na(Fe2+,Mn2+)4(PO4)3, xenophyllite Na4(Fe2+,Mn2+)7(PO4)6, an unidentified Na\u2013Fe phosphate Na2(Fe2+,Mn2+)17(PO4)12, and sometimes chromite-2. Dendritic\u2013skeletal growth of crystals (providing evidence of very rapid quenching) is found in all associations of the impact melt (silicate part, vugs, metal\u2013sulfide aggregate, metal\u2013sulfide blebs, and phosphate globules). The following crystallization sequence is revealed in the Na\u2013Fe phosphate globules: chromite-2 \u2192 sarc\u043epside\/graftonite \u2192 galileiite \u2192 xenophyllite. They are thought to have formed due to the separation of Na\u2013Fe phosphate liquid from homogenous Fe\u2013Ni metal\u2013sulfide melt enriched in Na, P, Cr, and O. The Na\u2013Ca\u2013Mg\u2013Fe phosphates crystallized without involvement of any processes of liquid immiscibility, directly from silicate melt. The paper provides data on the chemical composition and Raman spectroscopy of all studied phosphates and the major minerals of the impact melt associations of the Chelyabinsk meteorite.”<\/p>\n","protected":false},"excerpt":{"rendered":"
V. V. Sharygin Geochemistry International, Volume 63, pages 778\u2013799, Published: 23 September 2025 LINK “Na\u2013Fe and Na\u2013Ca\u2013Mg\u2013Fe phosphates were found in the impact melt associations of the Chelyabinsk meteorite (Chebarkul fragment). They drastically differ in…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48,24,7,47],"tags":[1833,364,262,1807,3443,1832],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39169"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=39169"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39169\/revisions"}],"predecessor-version":[{"id":39170,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/39169\/revisions\/39170"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=39169"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=39169"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=39169"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}