Britholite-(Y)

britholite-(Y)

yttrialite-(Y)

thorite

tengerite-(Y)

Images

Formula: (Y,Ca)5(SiO4)3(OH)
Nesosilicate (insular SiO4 groups), britholite group, 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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