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Rhodochrosite from Islay, Argyllshire and Dalroy, Inverness-shire, Scotland

Published online by Cambridge University Press:  05 July 2018

Keith Nicholson
Keith Nicholson*
Affiliation:
Department of Applied Geology, University of Strathclyde, Glasgow, G1 1XJ, Scotland
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Abstract

Rhodochrosite has been discovered as a minor component of two manganese deposits in Scotland. At Islay it occurs as coatings and veinlets on and within hollandite-pyrolusite-hematite-goethite mineralisation. Two foram microfossils were found within the carbonate which is considered to have formed from the interaction of organic-rich groundwater and seawater. The Dalroy rhodochrosite has the form of stromatactis-like cavity infill structures and veinlets in a mineralogically complex manganese-iron ore in which braunite, bustamite, manganoan ilmenite and pyrophanite have been identified. Intergrowths of rhodochrosite and native copper grains occur in a calcite matrix within the infill structures. These intergrowths are typically one micrometre across, but achieve diameters of up to 50 µm. The genesis of the Dalroy rhodochrosite is more problematical, although a hydrothermal source is most likely.

Keywords

rhodochrositenative copperIslayDalroyScotland
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 363 , December 1987 , pp. 677 - 680
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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Footnotes

*

Present address: Geothermal Institute, University of Auckland, Private Bag, Auckland, New Zealand.

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