Urtite

an alkali intrusive rock containing 80 to 90 percent nepheline. It may also contain as much as 10 percent aegirine or aegirine-augite, as well as admixtures of albite and sphene. Urtite is not widely distributed. It occurs in the form of small, often sheetlike, bodies among other alkali rocks. Urtites from Krasnoiarsk Krai, which are especially rich in nepheline (the Kiia-Shaltyr’ deposit), serve as the primary raw material for the production of aluminum; the by-products of production are used as raw material for cement. Urtite was first discovered in the Lovozero Massif (Luiavr-Urt) on the Kola Peninsula (hence the name).

单词	urtite
释义	Urtite Urtite an alkali intrusive rock containing 80 to 90 percent nepheline. It may also contain as much as 10 percent aegirine or aegirine-augite, as well as admixtures of albite and sphene. Urtite is not widely distributed. It occurs in the form of small, often sheetlike, bodies among other alkali rocks. Urtites from Krasnoiarsk Krai, which are especially rich in nepheline (the Kiia-Shaltyr’ deposit), serve as the primary raw material for the production of aluminum; the by-products of production are used as raw material for cement. Urtite was first discovered in the Lovozero Massif (Luiavr-Urt) on the Kola Peninsula (hence the name).
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