Loparite

loparite

[′lō·pə‚rīt] (mineralogy) (Ce,Na,Ca)₂(Ti,Nb)₂O₆ A brown to black mineral; a variety of perovskite containing alkalies and cerium.

Loparite

a mineral of chemical composition (Na, Ce, Ca)₂-(Ti, Nb)₂O₆. The principal admixtures are Sr, Y, and Th. Loparite crystallizes in the isometric system, forming primarily small (up to 2-3 mm) crystals, which generally occur as penetration twins. Loparite is structurally similar to perovskite and exhibits no cleavage. It is black, opaque, and has a semimetallic luster. Its hardness is 5.5-6, and its density 4,750-4,890 kg/m³. Loparite occurs in nepheline syenites (sometimes as one of the rock-forming magmatic minerals) and, more rarely, in pegmatites genetically related to nepheline syenites.

单词	loparite
释义	Loparite loparite [′lō·pə‚rīt] (mineralogy) (Ce,Na,Ca)₂(Ti,Nb)₂O₆ A brown to black mineral; a variety of perovskite containing alkalies and cerium. Loparite a mineral of chemical composition (Na, Ce, Ca)₂-(Ti, Nb)₂O₆. The principal admixtures are Sr, Y, and Th. Loparite crystallizes in the isometric system, forming primarily small (up to 2-3 mm) crystals, which generally occur as penetration twins. Loparite is structurally similar to perovskite and exhibits no cleavage. It is black, opaque, and has a semimetallic luster. Its hardness is 5.5-6, and its density 4,750-4,890 kg/m³. Loparite occurs in nepheline syenites (sometimes as one of the rock-forming magmatic minerals) and, more rarely, in pegmatites genetically related to nepheline syenites.
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