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Wakefieldite

Rare-earth mineral

Wakefieldite ((La,Ce,Nd,Y)VO4) is an uncommon rare-earth element mineral. There are four main types of wakefieldite- wakefieldite-(La), wakefieldite-(Ce), wakefieldite-(Nd), and wakefieldite-(Y), depending upon the dominant rare-earth metal ion present. Wakefieldite has a Mohs hardness ranging from 4 to 5. Wakefieldite forms crystals of tetragonal structure. In terms of crystal structure, it is the vanadate mineral xenotime , it is more favorable for wakefieldite to contain the lighter rare-earth elements over the heavier ones. Due to the lanthanide contraction, the heavier rare earths have smaller ionic radii anion is replaced by the larger vanadate anion, the tetragonal crystal system preferentially accommodates the larger light rare-earth elements

Wakefieldite was first described for an occurrence in the Evans Lou mine, St. Pierre de Wakefield , Canada and later designated Wakefieldite-(Y).

Wakefieldite-(Ce) was first described as kusuite for its type locality in the Kusu deposit, 85 km (53 mi) SW of Kinshasa. It was renamed in 1977 as the Ce analog of wakefieldite-Y.

Wakefieldite-(La) was first described in 2008 for an occurrence in the Glücksstern mine, Gottlob Hill, Friedrichroda , Thuringia

Wakefieldite-(Nd) was first described in 2008 at the Arase mine, Kami, Shikoku Island

Identification

Color of mineral

Yellow

Mohs scale ( mineral hardness )

4

Density ( specific gravity )

2
2.14

Crystal ( diaphaneity )

Tetragonal