Description
Ardennite, here associated with quartz, belongs to the silicate group and the sorosilicate subgroup.
Its formula is: Mn2+4(Al, Mg)6(OH)6(AsO4)(SiO4)2Si3O10.
This sample comes from the type locality of the Salmchâteau mineral species, Vielsalm, Stavelot massif, Belgium.
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