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Mineral contains: Medaite
Gramaccioli C M, Griffin W L, Mottana A (1982) Medaite, Mn6[VSi5O18(OH)], a new mineral and the first example of vanadatopentasilicate ion. American Mineralogist 67, 85-89
Gramaccioli C M, Liborio G, Pilati T (1981) Structure of medaite, Mn6[VSi5O18(OH)]: the presence of a new kind of heteropolysilicate anion. Acta Crystallographica B37, 1972-1978
Nagashima M, Armbruster T (2010) Ardennite, tiragalloite and medaite: structural control of (As5+,V5+,Si4+)O4 tetrahedra in silicates. Mineralogical Magazine 74, 55-71