1. A rare plagioclase feldspar with high calcium oxide content occurring in igneous rocks. 
   钙长石一种氧化钙含量很高稀有斜长石，多出现于火成岩中
2. the commonest type of solidified lava; a dense dark gray fine-grained igneous rock composed chiefly of calcium-rich plagioclase feldspar and pyroxene. 
   最常见的凝固火山岩，是一种致密的深灰色火成岩，纹理细密，主要由富钙的斜长石和辉石组成。
3. Any of a group of abundant rock-forming minerals occurring principally in igneous, plutonic, and some metamorphic rocks, and consisting of silicates of aluminum with potassium, sodium, calcium, and, rarely, barium. About60 percent of the earth's outer crust is composed of feldspar. 
   长石任何一组由大量岩石形成的矿物，主要存在于火成岩、深成岩以及一些变性的岩石中，含有钾、钠、钙及极少的钠的铝硅酸盐，地球的外层地壳中约百分之六十是长石
4. To lose calcium or calcium compounds. 
   脱去钙，脱去钙化合物
5. calcium and phosphate metabolism 
   钙磷代谢

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• 1. 钙长石
  calcium extended titanium dioxide || 钙钛白...calcium feldspar || 钙长石...calcium ferrite || 铁酸钙
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