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Folvikite

About

Named after the Norwegian collector, Harald Oskar Folvik (1941-), who found the mineral.
First described as an "unnamed Mg-Mn-Sb-oxyborate" (Raade & Folvik 2013).

Type Locality
Kitteln Mine, Nordmark Odal Field (Nordmarksberg), Filipstad, Värmland County, Sweden
Mineral Data
Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4
Physical Properties
Colour: 
Black to dark reddish-brown
Crystal System: 
Monoclinic
Streak: 
Reddish-brown
Hardness: 
6
Tenacity: 
Brittle
Synonyms
Synonyms: 
IMA2016-026 and Unnamed (Mg-Mn-Sb Oxyborate)