Facts
- Chemical formula
- ☐Na₂(Fe²⁺₃Fe³⁺₂)Si₂O₂₂(OH)₂
- Crystal system
- Monoclinic
- Mohs hardness
- 6.0
- Number of elements
- 5
- IMA status
- Redefined
- Type locality
- Socotra
- Named after
- Emil Riebeck
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q256865