The Gadolinite reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Gadolinite

Gadolinite is a mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of erbium, yttrium, cerium, beryllium and iron. It is a source of rare earth metals.

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