Overite

overite

apatite

variscite

crandallite

Formula: CaMgAl(PO4)2(OH).4H2O hydrated phosphate with hydroxyl, overite group
Specific gravity: 2.53
Hardness: 3½ to 4
Streak: White
Colour: Light apple-green to colourless; colourless in transmitted light
Solubility: Readily soluble in hot nitric acid
Environments:

Pegmatites
Hydrothermal environments

Overite is a secondary phosphate mineral found in altered phosphate nodules in sediments and in granitic pegmatites (Dana).

Localities

At the Tanco Mine, Bernic Lake, Lac-du-Bonnet area, Manitoba, Canada, overite occurs in a complex granite pegmatite (HOM).
The assemblages of minerals in the pegmatite were deposited in succession from petalite + quartz to spodumene + quartz to eucryptite + quartz (R&M 92.2.153).

At the type locality, Clay Canyon, Fairfield, Oquirrh Mountains, Utah county, Utah, USA, overite is associated with crandallite, variscite and apatite (Dana, HOM).

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