Formula: (Ce,La,Y)NbO4
Origin of name: For R. Ferguson, Scottish physician
Crystal system: Tetragonal
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Brownish black to black, crystal surfaces alter to gray, brown or yellow
Diaphaneity: Opaque
Luster: Vitreous, submetallic, dull
Habit: Crystals short to long prismatic or pyramidal; massive, grains
Hardness: 5.5 to 6.5
Specific gravity: 5.70
Cleavage: 1; {111} trace
Tenacity:
Streak: Greenish grey, yellowish brown, brown
Synonyms/varieties:
Comments: There are actually three closely related fergusonites (Ce, Nd, Y). Each one is dimorphic with the corresponding fergusonite-beta
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