AM_Piemontite_2 Formula: Ca1.799 Sr.201 Al1.869 Mn.808 Fe.323 Si3 O13 H Name: Piemontite Unit cell: 8.934 5.727 10.3 90.0 115.26 90.0 , V=476.61 Space group: P121/M1 (11)

Catti M , Ferraris G , Ivaldi G , American Mineralogist , 73 (1988) p.1370-1376, Thermal behavior of the crystal structure of strontian piemontite, Sample: T = 800 C