Silica bearing rock samples collected fromvarious locations of the rock from Bihubar, Assam,India were studied using XRD, FT-IR and chemicalanalysis for assessing the durability of these rocksused for different purposes like building and roadconstructions. XRD patterns of the rock samples-reddish coloured rock variety (2QPR) and whitecoloured rock variety (5QRS) showed that the samplescontained the amorphous and crystalline materials,the former being the major one in both the samples.Both the samples contained #alpha#-quartz as the majorphase with rutile, albite, calcite and illite-2M_1 for2QPR and muscovite-2M_1, illite and analcime for 5QRSas the minor phases. Microstrains and crystallitesizes of #alpha#-quartz associated in the rock sampleswere derived by using Fourier and integral methods.FT-IR and chemical analysis are also included tosupplement the result obtained from XRD method. Thepresence of the clay minerals and microstrains in boththe samples indicate the possibility of degradationof the rocks in environment and hence ultimatelyeffects its durability in utilization.
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