Records of the Geological Survey of India, Volume 114, Part 5The Survey, 1982 - Earthquakes Vols. 1- include Report of the Geological Survey, 1867- ; v. 32- include Review of the mineral production of India, 1898/1903- ; v. 75 consists of Professional papers, no. 1-16; v. 76 consists of Bulletins of economic minerals. |
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Page 56
... corundum leads to the addition of silica and depletion of alumina . The definite replacement by Na is indicated by a higher Na , O value of 2.66 % in the altered rim , while it is only 0.30 to 0.60 % in the core of the corundum crystals ...
... corundum leads to the addition of silica and depletion of alumina . The definite replacement by Na is indicated by a higher Na , O value of 2.66 % in the altered rim , while it is only 0.30 to 0.60 % in the core of the corundum crystals ...
Page 57
... corundum from core 2,3 . Ephesite from the alteration rim 4.Un altered corundum from the core of the sample Fig . 3 X - RAY ANALYSIS 4 Ephesite ( H2 Na Al2 SiO2 O12 ) is the major mineral identified by X - ray studies . This is a ...
... corundum from core 2,3 . Ephesite from the alteration rim 4.Un altered corundum from the core of the sample Fig . 3 X - RAY ANALYSIS 4 Ephesite ( H2 Na Al2 SiO2 O12 ) is the major mineral identified by X - ray studies . This is a ...
Page 58
... corundum producing area of the world . Brown and ruby corundum occur in deposits flanking pegmatite dykes that intrude basic igneous rocks . The border zone is a highly altered mass called plumasite with notable amounts of dark mica and ...
... corundum producing area of the world . Brown and ruby corundum occur in deposits flanking pegmatite dykes that intrude basic igneous rocks . The border zone is a highly altered mass called plumasite with notable amounts of dark mica and ...
Contents
A genetic model for the Sandur manganese ores RN Mishra | 10 |
A note on the intertrappean stratigraphy of Gandhari Kamareddi and Ramayampet areas Nizamabad 19 | 19 |
On the high grade schistose rocks equivalent to the Sargur schist complex in Kasaragod taluk | 31 |
Copyright | |
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Common terms and phrases
alteration Andhra Pradesh anorthosite anorthositic rocks apatite Archaean ascomata Attapadi Barakar Formation bauxite bauxite deposits belt biotite borehole Cannanore Cannanore district charnockite Chlorite chrysoberyl clay coal seams coal-sand ratio colour contours corundum Cuddapah Basin diopside emerald Ephesite facies feldspar fibrous quartz foliation fossil gabbro garnet garnetiferous sillimanite gneiss gem tracts gemstones Geol Surv Ind Geological Survey gneiss grains granite granulite green high grade hornblende idiomorphic magnetite crystals Intertrappean bed iolite iron isopach Jour Geol Kabbani Karnataka Kerala Krishna kyanite laterite lignite lineament lithofacies lithological magnetite manganese Margarite massif metamorphism migmatite minerals moonstone Mysore Nair number of coal occur ostiole pegmatite Perinthatta plagioclase planation surfaces pollen pyroxene quartz quartzite Ramanujam ratio map regional ruby samples sand Sandur sapphire Schist sedimentary sediments sillimanite South southern strand plain stratiform stratigraphic Survey of India taluk Tamil Nadu tectonic Tertiary thickness trend upto Warkalli Wynad zircon