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Formula: MgAl2(PO4)2(OH)2.8H2O
Hydrated phosphate with hydroxyl,laueite group
Crystal System: Triclinic
Specific gravity: 2.23 measured, 2.22 calculated
Hardness: 3½
Streak: White
Colour: Smoky-white, buff, colourless; crystals = pale pink or pale green on tips, colourless
in transmitted light
Solubility: Soluble in acids
Environments：
Pegmatites
Hydrothermal environments
Gordonite is a rare secondary mineral formed from the alteration of
variscite in nodules in
limestone or as a late-stage hydrothermal mineral in
complex granitic pegmatites
(Mindat).
At the Penrice marble quarry, Angaston, Barossa Valley, Mount Lofty Ranges, South Australia, gordonite crystals have been found
scattered on goethite and often perched on minyulite
crystals (AJM 17.1.18).
At Tom's quarry, Tom's Quarry, Kapunda, Mount Lofty Ranges, South Australia, gordonite is associated with
quartz and also with aldermanite
(AJM 17.1.18).
At the Mount Deverell variscite deposit, Milgun Station, Western Australia, gordonite
overgrows mitridatite, leucophosphite and
foggite, and is post-dated by crandallite and
hydroxylapatite. The variscite deposits are
hosted by marine sedimentary rocks
(AJM 20.2.26).
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