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Cubic and octahedral magnetite specimens from a variety of localities have been examined to ascertain the influence of chemical composition on their morphology. The presence of cations which favor occupancy of the A site in the magnetite spinel structure is shown to be significant in the formation of cubic magnetite at concentrations of x=0.02 in the formula Zn/sub x/Fe/sub 3-x/O/sub 4/, with unusual order-disorder phenomena accompanying this change in habit.
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Clark et al. (1997) studied this question.
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