Figure 7
From: Effects of groundwater and distilled water on the durability of evaporitic rocks
Microscopic description, SEM and XRD of an evaporitic rock Group 1 (fresh sample, after slaking with distilled water and groundwater respectively). G1a-G1c represents thin section images under cross-polarized microscope showing mega crystalline pure prismatic gypsum crystals before SDI and fibro-radiating basanite intergrowth with microcrystalline anhydrite after SDI test. G1d-G1f. represents SEM images showing tabular gypsum and needle shaped before SDI with interspersed in a loose fabric and filling anhydrite in the microfractures after SDI test. G1g-G1i represents XRD analyses showing dominant of gypsum before SDI test where after SDI dominance of hemihydrate- dehydrated calcium sulfate.
