Facts
- Chemical formula
- Sb⁵⁺Mn³⁺(Mg,Mn²⁺)₁₀O₈(BO₃)₄
- Crystal system
- Monoclinic
- Mohs hardness
- 6.0
- Number of elements
- 5
- IMA status
- Approved
- Type locality
- Kitteln mine, Nordmark Odal field
- Named after
- Harald Oskar Folvik
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q26985001