Formula: (Ce,La,Nd)NbO4
Origin of name: For R. Ferguson, Scottish physician
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 5.292 Ǻ, b = 10.94 Ǻ, c = 5.069 Ǻ, β = 94.6°
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Comments: Three distinct species with the extensions -(Ce), -(Nd) and -(Y) indicating the predominant rare earth cation in the formula; dimorphous with fergusonite
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