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ATHENA

MINERALOGY

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Mineral: HJALMARITE
Formula: Na(NaMn)Mg5Si8O22(OH)2
Crystal System: Monoclinic
Group: Amphibole supergroup, with (OH,F,Cl) dominant. Na-(Mg-Fe-Mn) subgroup. Hjalmarite group
IMA Number: 2017-070
References: MM 81 (2017), 1577-1581
Type Locality: Långban (Langban), Fe-Mn-(Ba-As-Pb-Sb) deposit, Filipstad district, Värmland, Sweden

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