Englishite

phosphate

montgomeryite

Formula: K3Na2Ca10Al15(OH)7(PO4)21.26H2O hydrated phosphate with hydroxyl
Specific gravity: 2.68
Hardness: about 3
Streak: White
Colour: Colourless to white, grayish green, colourless in transmitted light
Environments:

Pegmatites
Hydrothermal environments

Englishite occurs in variscite nodules at the type locality Clay Canyon, Utah, USA, associated with montgomeryite, wardite, millisite and crandallite. It is also found in the Tip Top pegmatite, South Dakota, USA, associated with crandallite and other phosphates (Dana).

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