Rocks / Garnet-pyroxene-gneiss.
The pyrope in this specimen, Mg3Al2(SiO4)3 is a member of the garnet group with high Mg content, and occurs in high grade metamorphic rocks. The dark bands of mineral appear to be pyroxene, which is a Mg,Fe, silicate (Mg,Fe)SiO3 sometimes referred to as hypersthene. The white or light coloured mineral is quartz. The specimen is a gift from Bill Fitches who collected it from the Shai hills, in Ghana.
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