Nickeline
Natsume, Oya city, Yabu county, Hyogo pref., Japan
Width: 30 mm. Nickeline associated with gersdorffite. The copper-red parts with a metallic luster are nickeline. The dark gray parts are gersdorffite.
Recovered from a nickeline-gersdorffite nodule in a Fe-Ni deposit of serpentinitized harzburgite, a part of an opholite.
The first nickeline from Japan was reported from this location in 1907.