If the unit cell of a mineral has cubic close packed 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. 1/2 , 1/ 8
b. 1 , 1/4
c. 1/2 , 1/ 2
d. 1/4 , 1/ 8
Ans. a
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