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Jones, D/ Wilson, MJ/ Tait, JM 1980: Weathering of a basalt by Pertusaria corallina. - Lichenologist 12: 277-289. [RLL List # 109-53 / Rec.# 9460]
Keywords: PERTUSARIA/ WEATHERING/ BASALT/ SAXICOLOUS/ LABRADORITE/ SEM/ OXALIC
Abstract: 6 figures. [Detailed study using SEM and other techniques. "Lichen weathering results in extensive etching of the primary rock-forming minerals, particularly labradorite, and in the degredation of the clay minerals to yield a thin ochreous crust of poorly-ordered ferruginous (ferrihydrite) and alumino-silicate materials. These changes are brought about principally by the oxalic acid secreted by the mycobiont, a conclusion supported by observations following experimental mineral alternation."]

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