Gadolinite

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Gadolinite
Gadolinite (black portion at top)
General
Category	Nesosilicate
Formula (repeating unit)	(Ce,La,Nd,Y)2FeBe2Si2O10
IMA symbol	Gad[1]
Strunz classification	9.AJ.20
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	P21/n

Gadolinite, sometimes known as ytterbite, is a silicate mineral consisting principally of the silicates of cerium, lanthanum, neodymium, yttrium, beryllium, and iron with the formula (Ce,La,Nd,Y)₂FeBe₂Si₂O₁₀. It is called gadolinite-(Ce) or gadolinite-(Y), depending on the prominent composing element (Y if yttrium predominates, and Ce if cerium). It may contain 35.5% yttria sub-group rare earths, 2.2% ceria earths, as much as to 11.6% BeO, and traces of thorium. It is found in Sweden, Norway, and the US (Texas and Colorado).