spinel structure

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spinel structure

mineral

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ferrites

In crystal: Ferrimagnetic materials
The crystal structure is called spinel, which is the mineral name for MgAl₂O₄. Ferrites are electrical insulators with magnetic ordering. Their insulating quality makes them useful as magnetic cores. When metallic ferromagnetic materials are exposed to alternating magnetic fields, significant heating losses occur from eddy currents. Ferrite magnets greatly reduce…
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olivines

In olivine: Meteorites and the Earth’s mantle
… that have both olivine and spinel structure. In the spinel structure, the oxygen atoms are arranged in cubic closest packing (in which the position of every third layer repeats that of the initial layer) instead of hexagonal closest packing (in which the position of every second layer repeats that of…
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