Anhydrous normal phosphate
Specific gravity: 3.12
Colour: Colourless, grey-white, light pink, light yellow; colourless in transmitted light
Solubility: Readily soluble in dilute acids
Whitlockite is an uncommon secondary mineral in complex zoned
granite pegmatites, in phosphate rock deposits, in caves where it is formed from leached
guano, and in chondrite meteorites. In
pegmatites it is associated with
apatite and quartz. In caves and islands it is
hydroxylapatite. In meteorites
it is associated with
stanfieldite, farringtonite and
At the Los Monges Island in the Caribbean Sea (Venezuela dependency), whitlockite has been found in phosphate rock, forming soft, earthy masses under a botryoidal crust of monetite. In two instances the whitlockite occurred as pseudomorphs after brushite and gypsum (AM 28.215-232).
At the type locality, the Palermo Number 1 Mine, Groton, Grafton county, New Hampshire, USA, whitlockite was found as a late hydrothermal mineral in altered triphylite in a granite pegmatite, associated with xanthoxenite, triphylite, siderite, quartz, ludlamite, fairfieldite, brazilianite, amblygonite, childrenite-eosphorite and apatite (Mindat, AM 34.692-705, Dana). The sequence of formation was whitlockite and quartz, then rhodochrosite then apatite and lastly a zeolite (AM 26.145-152).
Back to Minerals