OriginK-Feldspar from Madras, India. Exact location is unknown
- High in SiO2 (65 %m/m), Al2O3 (19 %m/m) and K2O (13 %m/m).
- Enriched in Rb (860 µg/g).
- Low in transition metals (<20 µg/g),most trace metals and REEs (<1 µg/g).
- Its endmember composition is Or77, Ab23 mol-%.
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The chemical composition of minerals, the Earth's building blocks, is of interest for both industry and science.