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Dear Chris, Calcite forms somewhat 'similar' growths & iron growths come in many forms as I am sure we have all seen at one time or another. A very interesting subject, also in conjunction with bacterial growths underground: ICI I think it was who used to send chemists around regularly to the Weadale mines to monitor the many types of growths found on timber and generally in the old workings. A very interesting subject, and one that would be a worthy candidate for a book by someone well versed in such matters - chemistry & bacteriology. Regards, Bernard. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%