Phlogopite separated from a Pyroxenite. Micas are often used for Rb-Sr and K-Ar dating.
OriginPyroxenite containing phlogopite from Phlogopite deposits of Bekily, South Madagascar
- SiO2 is low (38 %m/m).
- Except for MnO and CaO all other major elements are present in the
1.6 - 20 %m/m range.
- Transition metals are in the µg/g range.
- Ba and Rb are enriched (4000 µg/g and 1300 µg/g).
- REEs are well below 1 µg/g.
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The chemical composition of minerals, the Earth's building blocks, is of interest for both industry and science.