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Montgomeryite: Ca4MgAl4(PO4)6(OH)4·12(H2O) Tiptopite: K2(Na,Ca)2Li3Be6(PO4)6(OH)2·(H2O) Englishite: K3Na2Ca10Al15(PO4)21(OH)7·26(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
Montgomeryite: Ca4MgAl4(PO4)6(OH)4·12(H2O)
Comments: Matrix specimen covered with sprays to 0.5 cm of salmon colored montgomeryite crystals. Location: Tip Top Mine, Custer County, South Dakota, USA. Scale: 13 x 8 cm. © John Veevaert
Montgomeryite: Ca4MgAl4(PO4)6(OH)4·12(H2O) Tiptopite: K2(Na,Ca)2Li3Be6(PO4)6(OH)2·(H2O)
Comments: Clear, acicular crystals of tiptopite with red montgomeryite. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals