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Yet, only a few oxides are known in which carbon and silicon coexist within the same crystal lattice. These silicate\u2013carbonates typically contain trigonal carbonate [CO\n                    <jats:sub>3<\/jats:sub>\n                    ] groups and tetrahedrally coordinated silicate [SiO\n                    <jats:sub>4<\/jats:sub>\n                    ] units. In the CaO\u2013SiO\n                    <jats:sub>2<\/jats:sub>\n                    \u2013CO\n                    <jats:sub>2<\/jats:sub>\n                    system, no phase had previously been shown to contain both octahedrally coordinated silicon [SiO\n                    <jats:sub>6<\/jats:sub>\n                    ] and carbonate [CO\n                    <jats:sub>3<\/jats:sub>\n                    ] groups, nor had such a structure been theoretically predicted. Here, we report the synthesis of the calcium silicon double carbonate Ca\n                    <jats:sub>2<\/jats:sub>\n                    Si(CO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    , obtained by reacting tilleyite, Ca\n                    <jats:sub>5<\/jats:sub>\n                    (Si\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    )(CO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    , with CO\n                    <jats:sub>2<\/jats:sub>\n                    in diamond anvil cells at 39.5\u00a0GPa and 2600\u00a0K. The compound was subsequently temperature\u2010 and pressure\u2010quenched, remaining metastable at ambient conditions. Structural and spectroscopic characterization was performed using synchrotron single\u2010crystal X\u2010ray diffraction and Raman spectroscopy. The structure of Ca\n                    <jats:sub>2<\/jats:sub>\n                    Si(CO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    is unique among silicate\u2013carbonates, featuring sixfold\u2010coordinated Si sharing oxygen atoms with [CO\n                    <jats:sub>3<\/jats:sub>\n                    ] groups. Additionally, a novel calcium tetracarbonate, Ca\n                    <jats:sub>2<\/jats:sub>\n                    (C\n                    <jats:sub>4<\/jats:sub>\n                    O\n                    <jats:sub>10<\/jats:sub>\n                    ), containing tetrahedral [CO\n                    <jats:sub>4<\/jats:sub>\n                    ] units, was discovered. These findings reveal a new oxide chemistry under extreme conditions and open avenues for synthesizing metastable carbon\u2010bearing materials relevant to the deep carbon cycle.\n                  <\/jats:p>","DOI":"10.1002\/anie.202524999","type":"journal-article","created":{"date-parts":[[2026,1,22]],"date-time":"2026-01-22T06:36:52Z","timestamp":1769063812000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Experimental Observation of a Calcium Silicon Double Carbonate"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1498-988X","authenticated-orcid":false,"given":"Benedito Donizeti","family":"Botan\u2010Neto","sequence":"first","affiliation":[{"name":"Departamento de F\u00edsica Aplicada \u2013 ICMUV, MALTA Consolider Team Universitat de Val\u00e8ncia  Avda. 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