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Englishite: K3Na2Ca10Al15(PO4)21(OH)7·26(H2O) Tiptopite: K2(Na,Ca)2Li3Be6(PO4)6(OH)2·(H2O) Montgomeryite: Ca4MgAl4(PO4)6(OH)4·12(H2O)
Comments: Red montgomeryite lath-like crystals to 1mm in 2mm rosettes associated with clear, acicular sprays of tiptopite to 0.75mm and white cottonball-like crystals of englishite to 0.2mm. Location: Tip Top mine, Custer Co., South Dakota, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Englishite: K3Na2Ca10Al15(PO4)21(OH)7·26(H2O)
Comments: Bluish colliform englishite crystals. Location: Clay Canyon, Fairfield, Utah County, Utah. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Englishite: K3Na2Ca10Al15(PO4)21(OH)7·26(H2O) Roscherite: Ca(Mn++,Fe++)5Be4(PO4)6(OH)4·6(H2O)
Comments: Black crystalline aggregate of roscherite on white englishite. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals