Keywords: Paracelsian structure 010.png en Crystal structure of paracelsian BaAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub> monoclinic space group P2<sub>1</sub>/a with strong orthorhombic pseudo-symmetry projected onto the a c plane Data source G Chiari G Gazzoni J R Craig G V Gibbs S J Louisnathan 1985 Two independent refinements of the structure of paracelsian American Mineralogist 70 9-10 969-974 http //www minsocam org/ammin/AM70/AM70_969 pdf available online own Perditax 2012-02-01 Paracelsian Crystal structures in space group number 14 Cc-zero |