Abstract

It is orthorhombic with a 13.85(4), b 13.58(3), and c 9.65(3)Aa; a sub-cell with c' = c/3 is strongly evident. The X-ray powder pattern demonstrates an isostructural relationship with gageite; the strongest reflections are: 9.59(40)(110), 6.77(80)(020), 3.378(45)(410), 3.278(40)(140), 2.714(100)(050,510), 2.674(75)(150,223), and 2.516(40)(250). Suggested formula of (Mg,Fe (super 2+) ,Fe (super 3+) ,Mn (super 2+) , ) 42 Si 15 (O,OH) 90 .--Modified journal abstract.

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