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American Mineralogist; February 2003; v. 88; no. 2-3; p. 464-468
© 2003 Mineralogical Society of America
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Letter

Ultrapotassic clinopyroxene from the Kumdy-Kol microdiamond mine, Kokchetav Complex, Kazakhstan: Occurrence, composition and crystal-chemical characterization

Luca Bindi1,*, Oleg G. Safonov2, Vasily O. Yapaskurt3, Leonid L. Perchuk3 and Silvio Menchetti1

1 Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, I-50121, Florence, Italy
2 Institute of Experimental Mineralogy, Moscow district, 142432, Chernogolovka, Russia
3 Department of Petrology, Moscow State University, Vorobievy Gory, 119899, Moscow, Russia

Correspondence: * E-mail: lbindi{at}steno.geo.unifi.it

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)O6.00. Lattice parameters are: a = 9.773(1), b = 8.926(1), c = 5.269(1) Å, ß = 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.




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