Facts
- Chemical formula
- PbCa₂(Mg₃Fe³⁺₂)(Be₂Si₆)O₂₂(OH)₂
- Crystal system
- Monoclinic
- Mohs hardness
- 5.5
- Number of elements
- 8
- IMA status
- Redefined
- Type locality
- Långban
- Named after
- Joseph Victor Smith
- Colour
- black
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q3808760