Figure 9: Various habits of gypsum crystals, Dukhan Sabkha (a various shapes of gypsum crystals different in their sizes, b, c and d twining appears in lenticular and sub-lenticular crystals, e and f gypsum crystals dissolved as a result of heating). Lenses power is 2.5 and field view is 3.4mm; for e and f magnification is 40.