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The Canadian Mineralogist; June 2003; v. 41; no. 3; p. 649-657; DOI: 10.2113/gscanmin.41.3.649
© 2003 Mineralogical Association of Canada
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Articles

ON TYPE ROMARCHITE AND HYDROROMARCHITE FROM BOUNDARY FALLS, ONTARIO, AND NOTES ON OTHER OCCURRENCES

Robert A. Ramik1,§, Robert M. Organ2 and Joseph A. Mandarino3

1 Department of Earth Sciences, Royal Ontario Museum, Toronto, Ontario M5S 2C6, Canada
2 Netherlea, Ileene Road, Tarbert, Argyll, Scotland PA29 6TU , U.K.
3 Curator Emeritus, Royal Ontario Museum, Toronto, Ontario M5S 2C6, Canada

§ E-mail address: bobr{at}rom.on.ca

The type material of romarchite and hydroromarchite from Boundary Falls, Winnipeg River, Ontario, Canada, was re-examined. The minerals form deposits on pewter bowls and are products of tin corrosion in a unique cold freshwater environment. Type romarchite is very fine-grained and replaces pseudotetragonal crystals of an unknown precursor. Revised X-ray powder-diffraction data are consistent with the accepted tetragonal symmetry and space group P4/nmm, and provide the refined unit-cell parameters a 3.8014(3), c 4.8559(6) Å. Type hydroromarchite forms euhedral single crystals. Revised X-ray powder-diffraction data are consistent with the accepted tetragonal symmetry and space group PFormula21c, and provide the refined unit-cell parameters a 7.9269(5), c 9.0970(9) Å. Additional Sn-bearing corrosion products are SnO2 (cassiterite) and two unidentified phases. Residual aggregates of Pb, SbSn and Cu6Sn5 ({eta}-bronze) are found in areas of deep localized corrosion. Reports of romarchite subsequent to the original description are numerous, but those of hydroromarchite are few and only quite recent.

Keywords: romarchite, hydroromarchite, tin oxide, pewter, corrosion product, X-ray data, Boundary Falls, Ontario, Canada.




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