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Formula: (Y,Ca)5(SiO4)3(OH)
Nesosilicate (insular SiO4 groups), britholite group,
apatite supergroup, typically metamict,
yttrium-bearing mineral
Specific gravity: 4.25
Hardness: 5
Streak: Pale brown
Colour: Reddish-brown, black
Solubility: Soluble in cold dilute acids
Environments
Plutonic igneous environments
Pegmatites
Britholite-(Y) is found in alkalic rocks and their pegmatites,
associated with yttrialite-(Y),
thorite variety thorogummite,
tengerite-(Y) and allanite. It may alter to
bastnäsite and churchite-(Y)
(Dana, HOM).
Localities
There are two co-type Localities:
The Abukuma range, Fukushima Prefecture, Japan
and
The Suishoyama pegmatite, Iizaka Village, Kawamata, Date District, Fukushima Prefecture, Japan
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