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Nayak, B. R., Mohapatra, B. K. (1998) Two morphologies of pyrophanite in Mn-rich assemblages, Gangpur Group, India. Mineralogical Magazine, 62 (6) 847-856 doi:10.1180/002646198548070

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Reference TypeJournal (article/letter/editorial)
TitleTwo morphologies of pyrophanite in Mn-rich assemblages, Gangpur Group, India
JournalMineralogical MagazineISSN0026-461X
AuthorsNayak, B. R.Author
Mohapatra, B. K.Author
Year1998 (December)Volume62
Issue6
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_62/62-6-847.pdf+
DOIdoi:10.1180/002646198548070Search in ResearchGate
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Mindat Ref. ID342Long-form Identifiermindat:1:5:342:7
GUID0
Full ReferenceNayak, B. R., Mohapatra, B. K. (1998) Two morphologies of pyrophanite in Mn-rich assemblages, Gangpur Group, India. Mineralogical Magazine, 62 (6) 847-856 doi:10.1180/002646198548070
Plain TextNayak, B. R., Mohapatra, B. K. (1998) Two morphologies of pyrophanite in Mn-rich assemblages, Gangpur Group, India. Mineralogical Magazine, 62 (6) 847-856 doi:10.1180/002646198548070
Abstract/NotesAbstractPyrophanite is widely distributed in metamorphic Mn-rich rock assemblages of the Gangpur Group, India. It occurs in two distinct habits: as an independent phase, and as an exsolved phase within hematite. The well developed large sized crystals coexist with spessartine in Mn-silicate facies rocks. In contrast, the exsolved crystals occur as fine needle/bleb-like crystallites intergrown with hematite in Mn-silicate-oxide facies rocks. Compositionally the exsolved crystals are enriched in iron, present in both the ferric and ferrous states. The two morphologies of pyrophanite attest to their formation under different environmental conditions. The independent pyrophanite is formed from a Mn-Ti rich precursor under low oxygen fugacity conditions while the hematite-pyrophanite intergrowth evolved from an Fe-Mn-Ti rich precursor under higher fO2 conditions.

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Mohapatra, B. K.; Nayak, B. R. (1998) Characteristics of Manganite (?-MnOOH) in Manganese-Rich Gangpur Group of Rocks, Orissa. Journal Geological Society of India, 51 (4). 509-516 doi:10.17491/jgsi/1998/510409
Mohapatra, B. K.; Nayak, B. R.; Sahoo, R. K. (1997) Vernadite in Goriajbor Manganese Ores, Gangpur Group, India. Journal Geological Society of India, 49 (3). 331-336 doi:10.17491/jgsi/1997/490307
Mohapatra, B.K., Nayak, B. (2005) Petrology of Mn carbonate–silicate rocks from the Gangpur Group, India. Journal of Asian Earth Sciences, 25 (5) 773-780 doi:10.1016/j.jseaes.2004.07.006
NAYAK, B.R., MOHAPATRA, B.K. (1998) Mn-Pyroxenoids from Gangpur Group of rocks, Orissa, India. Journal of Mineralogy, Petrology and Economic Geology, 93 (10) 380-388 doi:10.2465/ganko.93.380
Mohapatra, Birendra K; Nayak, Bibhuranjan (2003) Mn-Olivine from Gangpur Group of Rocks, Orissa. Journal of the Geological Society of India, 61 (5). 581-587 doi:10.17491/jgsi/2003/610509
Dash, Nilima, Mohapatra, B. K. (2015) Shirozulite, a Brittle Mn-mica in Manganese Formation of Gangpur Group, Eastern India. Journal of the Geological Society of India, 85 (5) 547-550 doi:10.1007/s12594-015-0248-x
Nayak, B.R.; Mohapatra, B.K. (2005) Morpho-chemistry of Hematite in Manganese-rich Formation of Gangpur Group, Orissa. Journal of the Geological Society of India, 66 (4). 486-490 doi:10.17491/jgsi/2005/660411
Dash, Nilima, Nayak, Bibhuranjan, Mohapatra, Birendra Kumar (2020) The Supergene Mn-minerals in Gangpur Group, Eastern India and their Genesis. Journal of the Geological Society of India, 96 (4). 337-348 doi:10.1007/s12594-020-1562-5
NAYAK, B.R., MOHAPATRA, B.K., SAHOO, R.K. (1997) Mn-Pyroxenes from Gangpur Group of rocks, Goriajhar, Orissa, India. Journal of Mineralogy, Petrology and Economic Geology, 92 (10) 425-430 doi:10.2465/ganko.92.425
Dasgupta, Somnath, Fukuoka, Masato, Roy, Supriya (1984) Hematite-pyrophanite intergrowth in gondite, Chikla area, Sausar Group, India. Mineralogical Magazine, 48 (349) 558-560 doi:10.1180/minmag.1984.048.349.15
Tagirov, B. R. (1998) Solubility of Iron-bearing Minerals in Supercritical NaCl (KCl)-rich Acid Solutions. Mineralogical Magazine, 62 (3) 1488-1489 doi:10.1180/minmag.1998.62a.3.114
 
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