Abstract:
Rooseveltite occurs in the weathering zone of the San Francisco de los Andes and Cerro Negro de la Aguadita mines, located in the San Juan Province, Argentina, at 30° 22′S and 69° 33′W. It appears in grey, finegrained aggregates pseudomorph after bismuthinite. Refraction index ranges from n=2.10 to 2.30. The Vickers microhardness is 513 (4-5 of Mohs' scale). Chemical composition from electron micro probe measurements is As 21.5±1% and Bi 60.9±2%. Rooseveltite is monoclinic, with a0=6.878(1) Å, b0=7.163(1) Å, c0=6.735(1) Å, β=104° 46′±1′, Z=4, ρcalc.=6,94 g·cm-3, space group P 21/n. The synthetic compound was prepared by three different methods. The powder pattern are the same as that of the mineral. Refraction index nα=2.13(2) and nγ=2.25(2). The measured specific gravity is ρpobs.=7,01 g·cm-3. Cell parameters: a0=6.882(1) Å, b0=7.164(1) Å, c0=6.734(1) Å, β=104° 50.5′±0.7′, ρcalc.=6,94 g·cm-3. The synthetic material melts at about 950°C. After heating to 920°C no variations were observed in the powder diagram of the mineral. It is tried to explain the formation of rooseveltite in natural environment. © 1972 Springer-Verlag.
Registro:
Documento: |
Artículo
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Título: | Rooseveltite from San Francisco de los Andes and Cerro Negro de la Aguadita, San Juan, Argentina |
Autor: | Bedlivy, D.; Llambías, E.J.; Astarloa, J.F.H. |
Filiación: | Dpt. Cs. Geológicas, Fac. Cs. Exactes y Naturales, Univ. Buenos Aires, Ciudad Universitaria Pabellón 2, Buenos Aires, Argentina Univ. Nacional del Sur, Bahía Blanca, Argentina
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Año: | 1972
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Volumen: | 17
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Número: | 2
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Página de inicio: | 65
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Página de fin: | 75
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DOI: |
http://dx.doi.org/10.1007/BF01081452 |
Título revista: | TMPM Tschermaks Mineralogische und Petrographische Mitteilungen
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Título revista abreviado: | TMPM Tschermaks Petr. Mitt.
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ISSN: | 00413763
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00413763_v17_n2_p65_Bedlivy |
Referencias:
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- Bedlivy, D., Llambías, E.J., Astarloa, J., Wismutarsenate von San Francisco de los Andes und Cerro Negro de la Aguadita, San Juan, Argentinien. (Spanisch.) 4 (1969) Jornadas Geol. Argentinas, 1, pp. 67-73
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- Frondel, C., (1951) Dana's System of Mineralogy, p. 697. , Wiley, New York-London
- Garrels, R.M., Mineral species as functions of pH and oxidation-reduction potentials, with special reference to the zone of oxidation and secondary enrichment, of sulfide ore desposits (1954) Geochim. Cosmochim. Acta, 5, pp. 153-168
- Gmelins, (1964) Handbuch der anorg, p. 631. , Chemie, System, Nr. 19, Verlag Chemie., Weinheim/Bergstr
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- Llambías, E.J., Malvicini, L., The geology and genesis of the Bi−Cu mineralized breccia-pipe, San Francisco de los Andes, San Juan, Argentina (1969) Econ. Geol., 64, pp. 271-286
- Mooney, R.C.L., Crystal structure of tetragonal, bismuth arsenate, BiAsO<inf>4</inf> (1948) Acta Crystallographica, 1, pp. 163-165
- Mooney-Slater, R.C.L., Polymorphic forms of bismuth phosphate (1962) Z. Krist., 117, p. 378
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- Rosenheim, A., Thon, A., Über die Komplexbildung des Arsenatanions (1927) Z. anorg. allg., Chem., 167 (10), p. 14
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Citas:
---------- APA ----------
Bedlivy, D., Llambías, E.J. & Astarloa, J.F.H.
(1972)
. Rooseveltite from San Francisco de los Andes and Cerro Negro de la Aguadita, San Juan, Argentina . TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, 17(2), 65-75.
http://dx.doi.org/10.1007/BF01081452---------- CHICAGO ----------
Bedlivy, D., Llambías, E.J., Astarloa, J.F.H.
"Rooseveltite from San Francisco de los Andes and Cerro Negro de la Aguadita, San Juan, Argentina "
. TMPM Tschermaks Mineralogische und Petrographische Mitteilungen 17, no. 2
(1972) : 65-75.
http://dx.doi.org/10.1007/BF01081452---------- MLA ----------
Bedlivy, D., Llambías, E.J., Astarloa, J.F.H.
"Rooseveltite from San Francisco de los Andes and Cerro Negro de la Aguadita, San Juan, Argentina "
. TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, vol. 17, no. 2, 1972, pp. 65-75.
http://dx.doi.org/10.1007/BF01081452---------- VANCOUVER ----------
Bedlivy, D., Llambías, E.J., Astarloa, J.F.H. Rooseveltite from San Francisco de los Andes and Cerro Negro de la Aguadita, San Juan, Argentina . TMPM Tschermaks Petr. Mitt. 1972;17(2):65-75.
http://dx.doi.org/10.1007/BF01081452