Facts
- Chemical formula
- ☐(NaCa)(Mg₄Fe³⁺)Si₈O₂₂(OH)₂
- Crystal system
- Monoclinic
- Mohs hardness
- 5.5
- Number of elements
- 7
- IMA status
- Redefined
- Type locality
- Ilmen mountains
- Named after
- iron(III)
- Colour
- black
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q3743202