The anomalous production of X-rays which occurs when an electron beam is incident on a thin crystal under certain crystallographic directions has been used to study the site occupancy in a chromite from the Stillwater Complex, Montana with approximate composition (Cr0.37Fe0.23Al0.23Mg0.17)3O4. Cr and Al are found to have a strong octahedral and Mg a strong tetrahedral site preference. About 3/4 of the Fe atoms are on tetrahedral sites. Small amounts of Ti and V atoms, about 1/1000 of the total atomic content, are both found to occupy the octahedral sites.
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J. Taftø (1982) studied this question.