Hydrated phosphate containing hydroxyl, wardite group
Specific gravity: 2.83
Colour: White to light grey, colourless in transmitted light.
Millisite is found in altered phosphate deposits.
At the Mount Deverell variscite deposit, Milgun Station, Western Australia, millisite is associated with wardite. The variscite deposits are hosted by marine sedimentary rocks (AJM 20.2.26).
The type locality is Clay Canyon, Fairfield, Oquirrh Mountains, Utah county, Utah, USA.
At the Little Green Monster Variscite Mine, Clay Canyon, Fairfield, Oquirrh Mountains, Utah county, Utah, USA, millisite is associated with carbonate-rich fluorapatite and wardite (Dana).
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