Fig. 2. Photographic illustration of the isolated and purified soil and sediment organic matter (SOM). (a) Organic (opaque) and inorganic (transparent) matter observed under microscope (transmitted mode) (width of photo = 101 mm). (b) Tubular kerogen particle consisting of cell wall (light fluorescence) and nonfluorescent vitrinite (black) (81 mm). (c) Laminated algae-like organic particles having light fluorescence (81 mm). (d) Amorphous bituminite (81 mm). (e) Angular vitrinite (dark) encapsulated in amorphous bituminite matrices (51 mm). (f) Amorphous bituminite, liptodetrinite, and sporinite, and black tubular and angular vitrinite (black) (81 mm). (g) Fusinite or black carbon particle (reflect mode) (gray-dark) (51 mm). (h) Nonfluorescent tubular vitrinite (black) surrounded by liptodetrinite (strips) (81 mm). (i) Angular vitrinite having reflectance (R_o) of 0.7% (reflected mode) (81 mm).