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Podlesnoite, BaCa 2 (CO 3 ) 2 F 2 , a fluorocarbonate mineral recently discovered at the Kirovskii mine, Khibiny alkaline massif, Kola Peninsula, Russia, is orthorhombic,  Cmcm ,  a  = 12.501(8) Å,  b  = 5.846(3) Å,  c  = 9.443(5) Å,  V  = 690.1(7) Å 3 ,  Z  = 4,  D  calc  = 3.614 g/cm 3 . The crystal structure was solved from 561 unique reflections with  I  &gt; 2σ( I ) by direct methods and refined to  R ( F ) = 0.0278,  Rw ( F  2 ) = 0.0577. Podlesnoite is a representative of a new structure type slightly related to aragonite. The most specific feature of the podlesnoite structure is a honeycomb-like framework built by the columns of edge-sharing CaO 6 F 2  polyhedra; they are stretched parallel to the  c  axis. Interatomic bond-distances within these polyhedra vary from 2.2912(16) to 2.4883(15) Å. The CO 3  groups are parallel to the  ac  plane, the C—O bond distances range from 1.276(2) to 1.296(4) Å. The bond distances within BaO 6 F 4  polyhedra are 2.771(2) to 2.915(2) Å.

The crystal structure of podlesnoite, BaCa 2 (CO 3 ) 2 F 2