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单词 plagioclase
释义 plagioclase
[`plā·jē·ǝ´klās]
MINERALOGY
1. A type of triclinic feldspars having the general formula (Na,Ca)Al(Si,Al)Si2O8; they are common rock-forming minerals.
2. A series in the plagioclase group which can be divided into a number of varieties based on the relative proportion of the solid solution end members, albite and anorthite (An): albite (An 0-10) oligoclase (An 10-30), andesine (An 30-50), labradorite (An 50-70), bytownite (An 70-90), and anorthite (An 90-100). Also known as sodium-calcium feldspar.
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