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|Noun||1.||fergusonite - a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals|
atomic number 68, Er, erbium - a trivalent metallic element of the rare earth group; occurs with yttrium
atomic number 73, Ta, tantalum - a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
atomic number 39, Y, yttrium - a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition