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An example of the element Thorium

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Description from the source:
Zirconolite var. Polymignite ((Ca Fe Y Th) (Nb Ti Ta Zr) O4 orth.), Stavern (Fredriksva"rn), Larvik, Vestfold, Norway. Black, fractured on matrix. 2,5x1,4x1,2 cm; 3 g.
Source: Simone Citon
Contributor: John Gray
Acquired: 30 September, 2008
Text Updated: 1 October, 2008
Price: Trade
Size: 1"
Composition: (CaFeYTh)(NbTiTaZr)O4
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