If the unit cell of a mineral has cubic ...

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

`1/2, 1/8`

`1, 1/4`

`1/2, 1/2`

`1/4, 1/8`

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