Facts
- Chemical formula
- (Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ * nH₂O
- Mohs hardness
- 4.0
- Elements in formula
- Calcium, Potassium, Sodium, Manganese, Iron, Silicon, Aluminium, Oxygen, Hydrogen
- Number of elements
- 9
- IMA status
- Approved
- Type locality
- Franklin, Benallt Mine
- Named after
- Frederick A. Bannister
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q424817