Gadolinite-(Y)

Formula: Y₂Fe²⁺Be₂Si₂O₁₀

From Alfredo Petrov:

GADOLINITE-(Y) (gadorin-seki; ittoro-gadorin-seki)

• Fukushima: In rare-earth pegmatite at Suishohyama as dark green masses to 3cm. Also at Fusamata.
• Mie: Very dark brown, lustrous crystals to 2cm in Yokkaichi city. Dark green crystals at the Naegi mine. Greenish black, dull subhedral crystals to over 2cm at Ishigure (Ishigureminami) (probably = one of the previous 2 localities). Also at Suizawa (= one of 1st 2 locs.???).
• Yamanashi: Takehinata, as dark green crystals.

Above: Gadolinite-(Y), Miyazuma-kyo, Mie Prefecture, Japan. Width of view 17.25mm.