$SLIO The apatite is found within pyroxenite, gneiss, and quartzite units, which are part of the Grenville Group, and is in a NE-SW oriented lobe of green and red apatite with micas. This apatite deposit seems to originate from an alteration around a pegmatite intrusion. It seems to occur by the dissolution of phosphor in a limestone and re-concentration in the current deposit. The host rock is pyroxenite inserted in sillimanite-garnet gneiss.