Model of the crystal structure of biachellaite as a new 30-layer member of the cancrinite group |
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| Authors: | R. K. Rastsvetaeva N. V. Chukanov |
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| Affiliation: | (1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiĭ pr. 59, Moscow, 119333, Russia;(2) Institute of Problems of Chemical Physics in Chernogolovka, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia |
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| Abstract: | A crystal-structure model of biachellaite was determined. Biachellaite is a new mineral of the cancrinite group found in a volcanic ejectum from the Biachella Valley near Sacrofano Caldera (Italy). The unitcell parameters are a = 12.913(1) Å and c = 79.605(5) Å, sp. gr. P3. This mineral is characterized by a 30-layer packing of six-membered rings stacked in the following order: ABC ABC ACA CBA CBA CBC ACB ACB ACB ABC.... This new member of the cancrinite group has the largest number of layers and a maximum period of c ～ 80 Å. The structure contains four types of cavities, from the smallest cancrinite cavity to the largest liottite cavity. |
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