pollucite

Noun
  1. A rare mineral that is an important source of cesium (synset 114715246)
    is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
    substance holonym:
    • atomic number 55, caesium, cesium, cs - a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
    • atomic number 37, rb, rubidium - a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite

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