Figure 9. Scanning Electron Microphotographs of quartz grains; (a) Subangular grain with crystalline (secondary dendritic) overgrowth [1]; (b) Straight steps [1]; (c) Small pits [1], curved scratches [2], random scratches and grooves [3], featureless smooth grain surface [4]; (d) Straight striations & scratches [1], random scratches and grooves [2]; (e) Solution pits [1], solution crevasses (channels) [2], etched surface [3]; (f) Rounded to subrounded grain with bulbous edges along with curved scratches [1], Random scratches and grooves [2]; (g) Medium conchoidal fractures [1], adhering particles [2], solution crevasses (channels) [3]; (h) Arcuate steps [1]; (i) Small conchoidal fractures [1], solution pits [2], solution crevasses (channels) [3], curved scratches [4]; (j) Subangular grain with small conchoidal fractures [1], solution pits [2], solution crevasses (channels) [3], silica precipitation [4], etched surface [5]; (k) Rounded to subrounded grain with meandering ridges along with small pits [1], straight striations & scratches [2]; (l) Silica pellicle [1], silica tubes [2], etched surface [3]

From

Relation between Present Freshwater Diatom Assemblage and Grain Size of the Lake: A Comparative Case Study from the Two Swamps of Rani-Garbhanga Reserve Forest, Assam

Amulya Saxena, Abhijit Mazumder, Dhruv Sen Singh, Samir Kumar Bera

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