Figure 3From: The structure of volcanic cristobalite in relation to its toxicity; relevance for the variable crystalline silica hazard BSE images of resin mounted and polished cristobalite particles separated from volcanic ash sample MBA12/7/03. a) A particle composed solely of cristobalite; b) A particle composed of a cristobalite crystal still attached to the groundmass patch from which it nucleated; c) A particle of ‘feathery’ devitrified groundmass with a totally-devitrified cristobalite patch in the centre; d) A particle of cristobalite with a ‘rim’ of glassy groundmass.Back to article page