Records of the Geological Survey of India, Volume 117, Part 2The Survey, 1986 - 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 99
... Pyrophyllite and Diaspore · Pyrophyllite is the principal mineral exploited in the Bundelkhand massif . It is commonly associated with some diaspore . The history of pyrophyllite mining in quarries and in one underground mine goes back ...
... Pyrophyllite and Diaspore · Pyrophyllite is the principal mineral exploited in the Bundelkhand massif . It is commonly associated with some diaspore . The history of pyrophyllite mining in quarries and in one underground mine goes back ...
Page 100
... pyrophyllite - quartz and pure pyrophyllite rock occur in a quartz reef traversing the granitic rocks . The main colours of pyrophyllite are purple , greenish white and brownish black . Basu ( 1971-72 ) noted that the range of colour ...
... pyrophyllite - quartz and pure pyrophyllite rock occur in a quartz reef traversing the granitic rocks . The main colours of pyrophyllite are purple , greenish white and brownish black . Basu ( 1971-72 ) noted that the range of colour ...
Page 101
... pyrophyllite in some parts of the Singhbhum Granite massif . Thus , an epigenetic origin of pyrophyllite along faults and shear zones seem more plausible than a sedimentary of origin . The production figure for pyrophyllite and diaspore ...
... pyrophyllite in some parts of the Singhbhum Granite massif . Thus , an epigenetic origin of pyrophyllite along faults and shear zones seem more plausible than a sedimentary of origin . The production figure for pyrophyllite and diaspore ...
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albite amphibolite amphibolite facies aureole Babina banded iron-formation Basu Batholith Berwar Bijawar biotite bodies Bundelkhand Bundelkhand granitic massif Bundelkhand massif chlorite composition conglomerate country rocks crystals developed dips dolerite dykes emplacement enclaves esmeraldite exhibit feature feldspar folds foliation formation garnet Geol GEOLOGICAL SURVEY gneisses Gneissic Complex grade grained granite granite granitic rocks granitoid groundmass H₂O hornblende inclusions INDIA Records indicate intrusive Jhansi granite Jhararghat K-feldspar Kabrai Karesra Karitoran lamellae leucogranite magmatic magnetite Mahroni mapped Mau Ranipur megacrysts metabasic metamorphism microcline migmatites minerals muscovite Mylliem Mylliem Pluton myrmekite occur outcrops parallel pegmatite perthite phenocrysts plagioclase pluton porphyritic porphyritic coarse grained porphyritic granites Precambrian pyrophyllite quartz quartz reefs quartz-sericite rock quartzites recrystallization relict samples schist schistose sedimentary sediments sericite shear Shillong Group Shillong rocks Shillong Series South Khasi Batholith sphene strike structural suggest SURVEY OF INDIA syenitic textural trending twins upto veins xenoliths zone