作者p2b (U Make Me Wanna)
看板EarthScience
標題[問題] 請教依各問題.謝謝
時間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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