Anhydrous phosphate containing hydroxyl, manganese-bearing mineral
Specific gravity: 3.353
Colour: Pale yellow
Samuelsonite occurs as a secondary mineral in complex zoned
At the Buranga pegmatite, Muhororo, Ngororero District, Western Province, Rwanda, samuelsonite is associated with trolleite, bertossaite, scorzalite, apatite, burangaite and gatumbaite (HOM).
At the type locality, the Palermo No. 1 Mine, Groton, Grafton county, New Hampshire, USA, samuelsonite is found embedded in black ferric and manganic oxides and in pockets in whitlockite-carbonate-rich apatite rock (Dana). Associated minerals include childrenite, hydroxylapatite, arrojadite, whitlockite, carbonate-rich apatite and laueite. The samuelsonite appears to have crystallised towards the end of the paragnesis, and it is locally replaced by laueite crystals (AM 60.957, HOM).
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