AM_Effenbergerite_5
Formula: (Ba.5 Sr.5) Cu Si4 O12
Name: Effenbergerite
Unit cell: 7.39447 7.39447 15.8534 90.0 90.0 90.0 , V=866.84
Space group: P4/NCC (130)

Knight K S , Henderson C M B , European Journal of Mineralogy , 19 (2007) p.189-200, Structural basis for the anomalous low-temperature thermal expansion, behavior of the gillespite-structured phase Ba0.5Sr0.5CuSi4O10, Sample: T = 200 K