ULTRAPOTASSIC CLINOPYROXENE FROM THE KUMDY-KOL MICRODIAMOND MINE, KOKCHETAV COMPLEX, KAZAKHSTAN: OCCURRENCE, COMPOSITION AND CRYSTAL-CHEMICAL CHARACTERIZATION

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dc.contributor.author Bindi L.
dc.contributor.author Menchetti S.
dc.contributor.author Safonov O.G.
dc.contributor.author Yapaskurt V.O.
dc.contributor.author Perchuk L.L.
dc.date.accessioned 2021-11-23T00:58:47Z
dc.date.available 2021-11-23T00:58:47Z
dc.date.issued 2003
dc.identifier https://www.elibrary.ru/item.asp?id=13444201
dc.identifier.citation American Mineralogist, 2003, 88, 2-3, 464-468
dc.identifier.issn 0003-004X
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/32410
dc.description.abstract We report data on the composition and crystal structure of the most K-rich (3.61 wt% K2O) natural clinopyroxene yet discovered. The studied crystal was found as a tiny inclusion in garnet from a garnet-clinopyroxene rock of the Kumdy-Kol microdiamond mine. Kokchetav complex, Northern Kazakhstan. Microprobe analysis yields the formula (Ca0.61Fe0.13Mg0.04Mn0.01K0.17Na0.05) (Al0.61Mg0.39)(Si1.61Al0.39)O 6.00. Lattice parameters are: a = 9.773(1), b = 8.926(1), c = 5.269(1) Å, β = 105.75(1)°. The structure was refined up to Rall = 2.42% using 982 independent reflections. Substitution of K for Ca causes significant modification of the average structure. No evidence for an additional M2' position was found. Crystal-chemical characteristics are compared with published data on both natural and synthetic K-bearing clinopyroxenes.
dc.subject Clinopyroxene
dc.title ULTRAPOTASSIC CLINOPYROXENE FROM THE KUMDY-KOL MICRODIAMOND MINE, KOKCHETAV COMPLEX, KAZAKHSTAN: OCCURRENCE, COMPOSITION AND CRYSTAL-CHEMICAL CHARACTERIZATION
dc.type Статья


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