Formula: (Ce,La,Nd,Y)2FeBe2Si2O10
Origin of name: For J. Gadolin, Finnish chemist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 10.00 Ǻ, b = 7.56 Ǻ, c = 4.77 Ǻ, β = 90.3°
Colour: Green, greenish black, brown, light green
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals prismatic, may be flattened, often rough and coarse; massive, compact
Hardness: 6.5 to 7
Specific gravity: 4.0 to 4.6
Cleavage: None
Tenacity:
Streak: Greenish-grey
Synonyms/varieties:
Comments: Two distinct species with the extensions -(Ce) and -(Y) indicating the predominent rare earth cation in the formula
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