Abstract
DURING the study of polished sections of manganese ores from the Kodur Group of mines, Srikakulam Dt., Andhra Pradesh, India, I came across three different types of jacobsite, associated with other manganese minerals like braunite, hausmannite, pyrolusite, cryptomelane, coronadite and γ-MnO2. It is the interesting variation in the colour and etch behaviour in the different types of jacobsite that attracted my attention, and investigations to find out the cause of such variation were attempted.
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References
Ramdohr, P., “Die Erzmineralien und Ihre Verwachsungen”, 718 (1955).
Uytenbogaardt, W., “Tables for Microscopic Identification of Ore Minerals”, 173 (Princeton Univ. Press, 1951).
Mason, B., Geol. Foren. Forhandl., 65, 146 (1943).
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ROY, S. Variation in Etch Behaviour of Jacobsite with Different Cell Dimensions. Nature 183, 1256–1257 (1959). https://doi.org/10.1038/1831256a0
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DOI: https://doi.org/10.1038/1831256a0
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