The britholite group includes:
britholite-(Ce):
(Ce,Ca)5(SiO4)3(OH)
britholite-(Y):
(Y,Ca)5(SiO4)3(OH)
fluorbritholite-(Ce):
(Ce,Ca)5(SiO4)3F
fluorbritholite-(Nd):
Cd2Nd3(SiO4)3F
fluorbritholite-(Y):
(Y,Ca)5(SiO4)3F
tritomite-(Ce):
Ce5(SiO4,BO4)3(OH,O)
tritomite-(Y):
Y5(SiO4,BO4)3(OH,O,F)
The britholite group is a member of the apatite supergroup.
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