• D. Mahesh and G. Prabhakar

The feldspar deposits occurred around Kandukuru area of Ranga Reddy District of Telangana state covers the northern part of the Eastern Dharwar Craton (EDC) in South India. This region is predominantly consists of quartzo-felspathic veins and pegmatites occurred within the Archean granitic terrain. The production of feldspar mineral deposits are mainly from these pegmatites and feldspathic veins of the area and an average production is about 48000 tones for year in the Ranga Reddy district alone. The feldspar deposits of Kandukuru and surrounding areas (N170 4’ 5’’ E 780 30’ 11’’) are well exposed, ellipsoidal to lenticular pegmatite masses with intrusive relationship with granites, trending NW-SE directions. Mineralogically the deposits are mainly composed of perthites and antiperthites as essential constituents. Orthoclase, plagioclase and quartz present as accessory minerals. These minerals are coarse grained with extreme irregularity textures, show remarkable variation in coarseness, whereas the coarser bodies are commercially valuable for their feldspar. Perthites are mostly string, vein to coarse vein types, shows simple twining with occasional micro fractures. Geochemical characteristics shows that the K2O contents ranges from 5.63 to 12.2 wt.%, Na2O ranges from 1.65 to 2.3 wt.%, CaO from 0.3 to 1.2 wt.% and SiO2 ranges from 59.4 to78.33 wt.%. MgO and Fe2O3 ranges from 0.01 to 0.48 wt.% and 0.32 to 1.59 wt.% respectively. The occurrence of perthite intergrowths indicates the hypersolvus nature of the feldspars and the estimated melting temperature 12000C is also conforms the same. When plotted in K2O - Na2O - CaO ternary diagram on the basis of X-ray fluorescence major oxides the feldspar occupies the alkali orthoclase feldspar field.

Feldspar, Mineral Deposits, Ranga Reddy, Eastern Dharwar Craton

"Characterisation of feldspar mineral deposits, Kandukuru and surrounding areas of Ranga Reddy District, Telangana State", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 12, page no.177-189, December-2020, Available :http://www.jetir.org/papers/JETIR2012027.pdf

"Characterisation of feldspar mineral deposits, Kandukuru and surrounding areas of Ranga Reddy District, Telangana State", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 12, page no. pp177-189, December-2020, Available at : http://www.jetir.org/papers/JETIR2012027.pdf