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Britholite-(Y): (Y,Ca)5(SiO4,PO4)3(OH,F)
Comments: Brown cm-size britholite-(Y) grains with typical prismatic 'apatite' outline in quartz matrix with black magnetite. Tengerite-(Y) forms the white encrustation in upper right part of the photo. Location: West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 3.5x3.5 cm. © Pavel M. Kartashov