cassiterite

Noun
  1. A hard heavy dark mineral that is the chief source of tin (synset 114694088)
    is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
    substance holonym: atomic number 50, sn, tin - a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide

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