AM_Hyttsjoite Formula: Pb18 Ba2 Ca5 Fe2 Mn2 Si30 Cl O96 Name: Hyttsjoite Unit cell: 9.865 9.865 79.45 90.0 90.0 120.0 , V=6696.05 Space group: R11-3 (1)

Grew E S , Peacor D R , Rouse R C , Yates M G , Su S-C , Marquez N , American Mineralogist , 81 (1996) p.743-753, Hyttsjoite, a new, complex layered plumbosilicate with unique tetrahedral sheets, from Langban, Sweden, Note: U(1,2) for Ca3 and Fe changed to match symmetry constraints.