AM_Cronstedtite_1 Formula: Fe3.63 Si1.37 O9 H4 Name: Cronstedtite Unit cell: 5.494 5.494 7.09 90.0 90.0 120.0 , V=185.33 Space group: P31M (157)

Hybler J , European Journal of Mineralogy , 18 (2006) p.197-205, Parallel intergrowths in cronstedtite-1T:, determination of the degree of disorder, Locality: Herja, Romania, Sample: HER, Note: 1T polytype