Abstract
The diamagnetic orientation of nonmagnetic oxide minerals has been investigated recently using single crystals of various size. The magnetic orientation of micron sized sheet silicate was observed in the magnetic field of about 1T. This effect can be applied for estimating the value of diamagnetic anisotropy, Δχ, even if the mm-sized single crystal of the mineral cannot be obtained. The field induced rotation and harmonic oscillations of large diamagnetic mineral samples were reported for the cm-sized single crystals of quartz, corundum, forsterite and calcite. The observation can be applied for the minerals with small Δχ values of less than 5×10-10 emu/cc. The origin of diamagnetic anisotropy of oxide minerals is discussed in terms of a new model, in which the anisotropy is assigned to the individual chemical bond in the [MO6] octahedral unit of the crystal.
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