Hostname: page-component-7bb8b95d7b-pwrkn Total loading time: 0 Render date: 2024-09-25T23:55:15.305Z Has data issue: false hasContentIssue false
  • English
  • Français

Ranciéite from Mazzano Romano (Latium, Italy)

Published online by Cambridge University Press:  05 July 2018

Eugenio Barrese ,
Ciriaco Giampaolo ,
Odino Grubessi  and
Annibale Mottana
Eugenio Barrese
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma, Città Universitaria, 00185 Roma, Italy
Ciriaco Giampaolo
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma, Città Universitaria, 00185 Roma, Italy
Odino Grubessi
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma, Città Universitaria, 00185 Roma, Italy
Annibale Mottana
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma, Città Universitaria, 00185 Roma, Italy
Get access Rights & Permissions [Opens in a new window]

Abstract

Ranciéite occurs as stalactites coated with 10 Å halloysite in an open fissure crossing the Mazzano Romano Mn-impregnated tuffs. Chemical analysis (by EMPA) gave: MnO2 71.9, CaO 6.11, BaO 2.85, MgO 1.53, K2O 0.86, Na2O 0.53 plus minor oxides, total 85.07% (average of sixteen spots). Thermal analysis gave a total loss of ∼ 20 wt% of which 13.9% can be attributed to bonded water. The resulting formula contains 4H2O rather than 3H2O, as in most published references. The loss of water leads to the formation of hausmannite plus unidentified phases, after a complex sequence of reactions. Dehydration is directly followed by an X-ray amorphous stage. The X-ray pattern and IR spectrum indicate a poor structural order, in agreement with the likely formation conditions of the Mazzano ranciéite at atmospheric pressure and very low temperatures (less than 50 °C), from cold water percolating through the main Mn deposit.

Keywords

ranciéitethermal analysisMazzano RomanoItaly
Type
Mineralogy
Information
Mineralogical Magazine , Volume 50 , Issue 355 , March 1986 , pp. 111 - 118
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

Present Address: Dipartimento di Scienze della Terra, Università della Calabria, 87030 Castiglione Cosentino Scalo, Cosenza, Italy.

References

Ambrosetti, P., Bonadonna, F.P., and Tolomeo, L. (1969) Boll. Soc. Geol. It. 88, 3-10.Google Scholar
Azzaro, E, Barrese, E., Di Sabatino, B., and Giampaolo, C. (1976) Rendiconti Soc. It. Mineral. Petr. 32, 647-59.Google Scholar
Bardossy, G., and Brindley, G.W. (1978) Am. Mineral. 63, 762-7.Google Scholar
Burns, R.G., and Burns, V.M. (1977) In Marine Manganese Deposits (G. P. Glasby, ed.), 185-248. Elsevier, New York.Google Scholar
Burns, R.G., and Burns, V.M. (1979) In Marine Minerals(R. G. Burns, ed.), 1-46. Mineral. Soc. Am. Short Course Notes, v. 6.CrossRefGoogle Scholar
Buser, W. (1959) In Internal. Oceanogr. Congr. AAAS(M. Sears, ed.), 962-3.Google Scholar
Chukhrov, F.V., and Bonshtedt-Kupletskaya, E.M. (1967) Mineralogy, II.3, 124. Nauka Press, Moscow.Google Scholar
Fleischer, M. (1983) Glossary of mineral species 1983. Google Scholar
Fleischer, M.and Richmond, W.E. (1943) Econ. Geol. 38, 269-86.CrossRefGoogle Scholar
Fornaseri, M. (1950) Rendiconti Soc. Mineral It. 6, 96-100.Google Scholar
Frenzel, G. (1980) In Geology and Geochemistry of Manganese (V. M. Varentson and G. Grasselly, eds.), vol. 1, 25-155, E. Schweitzerbartsche Verlagsbuchhandlung, Stuttgart.Google Scholar
Giovanoli, R. (1969) Chimia. 23, 470-2.Google Scholar
Hendricks, T.A., and Laird, W.M. (1943) Econ. Geol. 38, 591-602.CrossRefGoogle Scholar
Hewett, D.F., and Fleischer, M. (1960. Ibid. 55, 1-55.CrossRefGoogle Scholar
Lacroix, A. (1910) Mineralogie de la France et de ses colonies, IV, 329. Nollet, Paris.Google Scholar
Lenzi, G., and Mattias, P.P. (1978) Rendiconti Soc. It. Mineral. Petr. 34, 75-99.Google Scholar
Leymerie, A.F.G. A. (1859) Corns de Mineralogie, II, 329.Google Scholar
Locardi, E. (1965) Atti Soc. Tosc. Sc. Nat., serie A72, 55-173.Google Scholar
Lombardi, G., and Mattias, P.P. (1979) Geologica Romano. 18, 157-214.Google Scholar
Mattias, P.P., and Ventriglia, U. (1970) Mem. Soc. Geol. It. 9, 331-84.Google Scholar
Morten, L., Landini, F., Bocchi, G., Mottana, A., and Brunfelt, A.O. (1980) Chem. Geol. 28, 261-78.CrossRefGoogle Scholar
Nambu, M., and Tanida, K. (1971) J. Jap. Ass. Mineral. Petr. Econ. Geol. 65, 1-15.CrossRefGoogle Scholar
Perseil, E.A. (1967) C.R. Acad. Sci. Paris, 264D, 1241-4.Google Scholar
Perseil, E.A. and GiovanoH, R. (1979) In La Génese des nodules de Manganése,369-77 Colloques Intern. Centre Nat. Rech. Sci., 289, Gifsur-yvette.Google Scholar
Potter, R.M., and Rossman, G.R. (1979) Am. Mineral. 64, 1199-218.Google Scholar
Radonova, T.G., Daskalova, Y., and Punev, L. (1967) Bulg. Akad. Nauk, Izvest. geol. lnst., Ser. Geokh. Miner. Petr. 116, 127-33.Google Scholar
Richmond, W.E., Fleischer, M., and Mrose, M.E. (1969) Bull. Soc. Fr. Minéral. Cristallogr. 92, 191-5.CrossRefGoogle Scholar
Sudo, T., and Yotsumoto, H. (1977) Clays and Clay 1199-218. Minerals. 25, 155-6.CrossRefGoogle Scholar