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TECHNICAL PAPER

Figure 3: (a & b) Mineral magnetite; (c & d) Mineral hematite; (e & f) Laterite; (g, h, i and j) Granite with vermicular quartz and feldspars;
(k and l) Granite with quartz, feldspar, magnetite, biotite and hornblende [22]
The suddenly cooled igneous aggregates possess a fine- section images provided in Figure 5 (e, f, g, and h) [22] . These
grained texture, whereas the slowly cooled one attains a mineral assemblages include majorly quartz, feldspar, and mafic
coarse texture. The granite in Figure 4 [(g and h) and (i and j)] minerals.
exhibits a coarse-grained texture. Thin section images of a Limestone is a mono-mineral rock with a major constituent as
coarse grained quarzitic aggregate free from any impurities is calcite (CaCO 3 ). However, impurities may be present in the
presented in Figure 5 (a and b). Petrography of medium grained limestone aggregate as accessory minerals in the form of iron
siliceous aggregate is provided in Figure 5 (c and d). Medium oxide, silica, or dark coloured minerals [21] . The Figures 5 (i, j, k
to fine (or very fine) grained textures are presented in thin and l) and 6 (a and b) demonstrate the petrography of a pure

THE INDIAN CONCRETE JOURNAL | AUGUST 2022 13