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Anorthite :: Anorthite (n.) A mineral of the feldspar family, commonly occurring in small glassy crystals, also a constituent of some igneous rocks. It is a lime feldspar. See Feldspar..

Lanthanum :: Lanthanum (n.) A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La..

Volborthite :: Volborthite (n.) A mineral occurring in small six-sided tabular crystals of a green or yellow color. It is a hydrous vanadate of copper and lime.

Christianite :: Christianite (n.) Same as Anorthite.

Orthite :: Orthite (n.) A variety of allanite occurring in slender prismatic crystals.

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