Formula: Fe1.8 Cu.2 S2 O22 H28
Name: Melanterite
Unit cell: 14.06 6.505 10.943 90.0 105.75 90.0 , V=963.27
Space group: P121/C1 (14)

Peterson R C , The Canadian Mineralogist , 41 (2003) p.937-949, The relatinship between Cu content and distortion in the atomic structure, of melanterite from the Richmond mine, Iron Mountain, California, Sample: M10b, Locality: Richmond mine, Iron Mountain, California