Fig. 8
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Différentes formes de silice réputées délétères vis-à-vis de l’alcali-réaction dans un granite. Microscope optique polarisant. La base des images mesure une quinzaine de mm. Lumière polarisée-analysée. a : exsolutions de silice ; b : quartz à extinction ondulante.
Various types of silica deemed to be deleterious in a granite. Polarizing microscope. Picture length: about 15 mm. a: silica exsolutions in a feldspath; b: quartz showing sweeping or undulatory extinction when rotated.
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