Facts
- Chemical formula
- (BiO)₂Fe³⁺(PO₄)(OH)₂
- Mohs hardness
- 4.0
- Elements in formula
- Bismuth, Oxygen, Iron, Phosphorus, Hydrogen
- Number of elements
- 5
- IMA status
- Approved
- Type locality
- Neustädtel
- Named after
- Paul Keller
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q2063961