Materiales de Construcción, Vol 49, No 256 (1999)

The occurrence of rare minerals on decayed medieval Scottish building stone colonized by biological growths


https://doi.org/10.3989/mc.1999.v49.i256.431

M. S. Jones
Roslyn Associates, Spain

R D. Wakefield
Opto-Electronics Research Centre, School of Applied Sciences. The Robert Gordon University, United Kingdom

G. Forsyth
Opto-Electronics Research Centre, School of Applied Sciences. The Robert Gordon University, United Kingdom

Abstract


During the course of a study of biodeterioration at Hermitage Castle in the Scottish Borders various rare minerals: monohydrocalcite, nesquehonite and dypingite were found in association with the biological growths. Monohydrocalcite was found particularly in association with a green alga "Trentepohlia aurea". A brief review of previous publications concerning these minerals is given and the theory put forward with regard to the possible origin of the monohydrocalcite as a biogenic by product.

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