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Yimengite is a new species of mineral discovered in Shandong Province in 1980, with crystal chemical formula K(Cr, Ti, Fe, Mg, Al, Si)_(12)O_(19). It belongs to hexagonal system, and its cell parameters α_0=5.857 and c_0=22.940. 749 separate diffraction intensities of crystal were collected on RASA=IIS auto-four-circle single crystal diffractometer.All atomic coordination, temperature factor and degree of occupation were obtained by RASA-SAP interpretation system, and XTL crystallographic procedure, atomic distances and bond angles for each atom were calculated. Deviation factor R is 0.080.Through the medium of determination of the crystal structure of the new mineral yimengite, coordination form of monovaleace alkali metal element—potassium, etc. in high pressure have been cleared, a five fold coordination form of Fe cations—regular bipyramid has been established, and some new information on the geochemical state of some elements, such as Cr, Ti, etc. have been provided.
Yimengite is a new species of mineral discovered in Shandong Province in 1980, with crystal chemical formula K (Cr, Ti, Fe, Mg, Al, Si) 12 O 19 It belongs to hexagonal system, and its cell parameters α_0 = 5.857 and c_0 = 22.940. 749 separate diffraction intensities of crystals were collected on RASA = IIS auto-four-circle single crystal diffractometer. All atomic coordination, temperature factor and degree of occupation were obtained by RASA-SAP interpretation system, and X-ray crystallographic procedure, atomic distances and bond angles for each atom were calculated. Deviation factor R is 0.080. Through the medium of determination of the crystal structure of the new mineral yimengite, coordination form of monovaleace alkali metal element-potassium, etc. in high pressure have been cleared, a five fold coordination form of Fe cations-regular bipyramid has been established, and some new information on the geochemical state of some elements, such as Cr, Ti, etc. have been provided.