Analysis of Czech Alluvial placer deposit black sand
This video shows the analysis of Czech Alluvial placer deposit black sand which appears to be titanomagnetite with some Mn.
"Titanomagnetite is a solid solution of the two end members of Fe3O4 (magnetite) and Fe2TiO4 (ulvospinel), and has a spinel structure"
https://web.archive.org/web/201810300...
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