Canada: Phoscorite (14508)
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Fact sheet
Description: 

Phoscorite is a name used to describe apatite-magnetite rocks containing an iron-magnesian silicate. Normally that is forsterite, phlogopite or an amphibole species. Although our sample was initially thought to contain forsterite, later analysis provides evidence that the highly birefringent mineral is clinohumite. As this is also an iron-magnesium silicate we have retained the name phoscorite.

Rotation 1 - fluorapatite

Rotation 2 - clinohumite and magnetite

The 1138 ± 29 Ma Lackner Lake carbonatite-alkalic silicate rock complex is an ovoid 5 km by 6 km intrusion situated within the Kapuskasing structural zone in northeastern Ontario near the town of Chapleau, Ontario. It has notable REE, U, Th and Nb concentrations mainly in the form of fluorapatite and pyrochlore mineralisation.

In Place
In Time
Location description: 
Lackner Lake, Chapleau, near Timmins, Ontario, Canada
Accuracy:
Timescale:
Timescale: 
Proterozoic
Ma = Millions of years ago
In Focus
Collection:
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Type:
Type: 
igneous
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Rock-forming minerals:

Rock forming mineral:

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