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The document summarizes notes on some minerals found in the Black Reef series, including: 1) Carbon occurs in veinlets and aggregates in shale layers, deposited in capillary spaces between grains rather than replacing rock. 2) Silicification involved secondary quartz growth and veins, disturbing adjoining rocks. It preceded sulphide deposition. 3) Experiments found pyrite, not marcasite, in samples. Pyrite varied slightly from Witwatersrand pyrite in solubility. Sulphide precipitation persisted after other

Author

Michael Masa

Language

EN