ATHENA MINERALOGY |
Mineral: | JOHNINNESITE |
---|---|
Formula: | Na2Mn2+9(Mg,Mn2+)7(OH)8(AsO4)2(Si6O17)2 |
Crystal System: | Anorthic (Triclinic) |
Group: | Howieite group |
IMA Number: | 1985-046 |
References: | MM 50 (1986), 667; AM 79 (1994), 991; HB2/1 (1995); HB4 (2000) |
Type Locality: | Kombat mine, Tsumeb, Otavi, Namibia |
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