Home / Explore / Minerals / Fillowite Minerals Fillowite fillowite Na3CaMn²⁺11(PO4)9 Fillowite Mineral Specimen For Sale — via www.dakotamatrix.com · Source Overview Fillowite is a mineral species (phosphate mineral). It crystallises in the trigonal system. Nickel–Strunz class: 8.AC.50. Scientific references Fillowite — Wikidata. https://www.wikidata.org/wiki/Q18043473 Link