作者p2b (U Make Me Wanna)
看板EarthScience
标题[问题] 请教依各问题.谢谢
时间Mon Dec 1 12:14:44 2003
If some sodium (Na+) substitutes for calcium (Ca2+)in the plagioclase feldspars, why must some aluminum (Al3+)replace some silicon (Si4+) in the mineral's structure ??
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