samarskite

Noun
  1. A complex black mineral occurring in pegmatites (synset 115037235)
    is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
    substance holonym: atomic number 64, gadolinium, gd - a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
    substance meronym: pegmatite - a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements

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