Collinsite

phosphate

Formula:Ca2Mg(PO4)2.2H2O
Hydrated normal phosphate, fairfieldite group and forms a series with fairfieldite
Specific gravity: 2.99
Hardness: 3 to 3½
Streak: White
Colour: Light brown; light yellow-brown to colourless in transmitted light.
Solubility: Readily soluble in acids
Environments

Hydrothermal environments

Collinsite is a secondary weathering product typically incrusting other minerals (Webmin, HOM).

At Reaphook Hill, Australia, collinsite is associated with parahopeite, scholzite, cryptomelane and iron-manganese oxides (HOM).

At the type locality, the Francois Lake phosphate occurrence, Francois Lake, Omenica Mining Division, British Columbia, Canada, collinsite occurs in a vein deposit in andesite, associated with carbonate-rich hydroxylapatite and bitumen (Mindat, HOM).

At the Kovdor massif, Russia, collinsite is associated with bobierrite, kovdorskite and dolomite (HOM).

Common impurities:

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