If the unit cell of a mineral has a cubic close-packed (ccp) array of oxygen atoms with
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Question:
If the unit cell of a mineral has a cubic close-packed (ccp) array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively, are:
(A) ½, ?
(B) 1, ¼
(C) ½, ½
(D) ¼, ?
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