Fig. 9From: The synergic impacts of salt mixture and frost damage on rock decay: implications for the deterioration of rock-hewn heritagesMicrophotographs of the a-1 YM sample, b-1 LA sample, c-1 FL sample, d-1 LQ sample and e-1 sample under plane-polarized light (PPL); and a-2 YM sample, b-2 LA sample, c-2 FL sample, d-2 LQ sample and e-2 sample under cross-polarized light (XPL)Back to article page