Facts
- Chemical formula
- Ca₃Al₇.₇Si₃P₄O₂₃.₅(OH)₁₄.₁ · 8H₂O
- Crystal system
- Trigonal
- Number of elements
- 6
- IMA status
- Approved
- Type locality
- Dunton Gem quarry, Newry
- Named after
- Frank Croydon Perham
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q948632