greenland spar

Noun
  1. A white mineral consisting of fluorides of aluminum and sodium;
    A source of fluorine (synset 114697311)
    is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
    substance holonym: atomic number 9, f, fluorine - a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite
    same as: cryolite

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