Hydrated arsenate phosphate containing hydroxyl, an arsenic-bearing mineral
Specific gravity: 4.07
Hardness: 3 to 4
Streak: Pale green
Colour: Bright emerald green
Common impurities: Zn,P
Philipsburgite has been found at Potts gill mine, Cumbria, England, associated with cornwallite, bayldonite, mimetite and malachite (HOM).
Philipsburgite occurs sparingly in a secondary assemblage of unusual copper-lead-zinc arsenates and phosphates at the type locality, Black Pine mine, Montana, USA (AM 71.1279), associated with bayldonite, chrysocolla, mimetite, quartz, arthurite, duftite, tsumebite and veszelyite (Dana, HOM).
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