Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Rare Minerals from Rajpura-Dariba, Rajasthan, India 1: Owyheeite


Affiliations
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721302, India
2 Institute of Geology of Ore Deposits, USSR Academy of Sciences, Moscow 109017, Russian Federation
     

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Owyheeite is reported for the first time from an Indian ore deposit. Optical properties, microhardness and X-ray powder diffraction data of the mineral are furnished. Microprobe analysis yields the formula Pb4.76(Ag1.59CU0.11)h0.70Sb6.54Sl5.32. Comparison with other available microprobe data of samples from different localities indicates nonstoichiometric composition of the mineral phase. A small amount of copper seems necessary to stabilize the mineral, since it could not be synthesized in the system PbS-Ag2S-Sb2S3. Curved nature of lamellar grains and existence of spindle-shaped deformation (?) twins imply pre- or syn-tectonic crystallization of the mineral.
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  • Rare Minerals from Rajpura-Dariba, Rajasthan, India 1: Owyheeite

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Authors

Kanika Basu
Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721302, India
N. Bortnykov
Institute of Geology of Ore Deposits, USSR Academy of Sciences, Moscow 109017, Russian Federation
A. Mookherjee
Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721302, India
N. Mozgova
Institute of Geology of Ore Deposits, USSR Academy of Sciences, Moscow 109017, Russian Federation

Abstract


Owyheeite is reported for the first time from an Indian ore deposit. Optical properties, microhardness and X-ray powder diffraction data of the mineral are furnished. Microprobe analysis yields the formula Pb4.76(Ag1.59CU0.11)h0.70Sb6.54Sl5.32. Comparison with other available microprobe data of samples from different localities indicates nonstoichiometric composition of the mineral phase. A small amount of copper seems necessary to stabilize the mineral, since it could not be synthesized in the system PbS-Ag2S-Sb2S3. Curved nature of lamellar grains and existence of spindle-shaped deformation (?) twins imply pre- or syn-tectonic crystallization of the mineral.