Facts
- Chemical formula
- (Mg,Mn)₂(Mn³⁺,Sb⁵⁺)O₂(BO₃)
- Crystal system
- Monoclinic
- Mohs hardness
- 6.0
- Number of elements
- 5
- IMA status
- Grandfathered
- Type locality
- Långban
- Named after
- tablet
- Colour
- black
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q3905137