Hydrated phosphate containing hydroxyl, paramorph of pseudolaueite
Specific gravity: 2.94
Colour: Yellow to brownish yellow
Stewartite occurs in granitic
pegmatites. It is a rare, low temperature,
formed where triphylite has suffered retrograde alkali-leaching, oxidation
and hydration. It is associated with lithiophilite,
(AM 59.1272-1276, HOM).
At the type Locality, the Stewart Mine, Tourmaline Queen Mountain, Pala Mining District, San Diego county, California, USA, stewartite occurs in a pegmatite associated with phosphosiderite, lithiophilite, jahnsite-(MnMnMn) and hureaulite (Mindat, Dana).
Back to Minerals