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@prefix dct: <http://purl.org/dc/terms/> .
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    dct:description """
              This work reports the synthesis of ferri-clinoholmquistite, nominally Li2(Mg3Fe3+2)Si8O22(OH)2, at varying fO2 conditions. Amphibole compositions were characterized by X-ray (powder and single-crystal) diffraction, microchemical (EMPA) and spectroscopic (FTIR, Mössbauer and Raman) techniques. Under reducing conditions ( NNO+1, where NNO = Nickel–Nickel oxide buffer), the amphibole yield is very high (>90%), but its composition, and in particular the FeO/Fe2O3 ratio, departs significantly from the nominal one. Under oxidizing conditions ( NNO+1.5), the amphibole yield is much lower (<60%, with Li-pyroxene abundant), but its composition is close to the ideal stoichiometry. The exchange vector of relevance for the studied system is M2(Mg,Fe2+) M4(Mg,Fe2+) M2Fe3+–1 M4Li–1, which is still rather unexplored in natural systems. Amphibole crystals of suitable size for structure refinement were obtained only at 800 °C, 0.4 GPa and NNO conditions (sample 152), and have C2/m symmetry. The X-ray powder patterns for all other samples were indexed in the same symmetry; the amphibole closest to ideal composition has a = 9.428(1) Å, b = 17.878(3) Å, c = 5.282(1) Å, = 102.06(2)°, V = 870.8(3) Å3. Mössbauer spectra show that Fe3+ is strongly ordered at M2 in all samples, whereas Fe2+ is disordered over the B and C sites. FTIR analysis shows that the amount of CFe2+ increases for increasingly reducing conditions. FTIR data also provide strong evidence for slight but significant amounts of Li at the A sites.
            """ ;
    dct:identifier "hal-00091035" ;
    dct:issued "2026-05-08T01:42:57.019877"^^xsd:dateTime ;
    dct:language "en" ;
    dct:modified "2026-05-08T01:42:57.019881"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Synthesis, crystal structure and crystal chemistry of ferri-clinoholmquistite, Li 2Mg 3Fe 3+ 2Si 8O 22(OH) 2" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
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    dcat:keyword "infoeu-reposemanticsarticle",
        "infrared-and-mossbauer-spectroscopy",
        "journal-articles",
        "microprobe-analysis",
        "sdustumisciences-of-the-universe-physicsearth-sciencesmineralogy",
        "short-range-order",
        "structure-refinement",
        "synthetic-ferri-clinoholmquistite" ;
    dcat:landingPage <ISSN:%200342-1791> .

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<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00091035v1/resource/2142f68c-2668-4a9c-8997-7a7acf7ac48f> a dcat:Distribution ;
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    dct:issued "2026-05-08T01:42:57.033136"^^xsd:dateTime ;
    dct:modified "2026-05-08T01:42:57.001402"^^xsd:dateTime ;
    dct:title "Synthesis, crystal structure and crystal chemistry of ferri-clinoholmquistite, Li 2Mg 3Fe 3+ 2Si 8O 22(OH) 2" ;
    dcat:accessURL <https://insu.hal.science/hal-00091035> .

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