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Selective dissolution and formula derivation of clay vermiculite from some Tuscan soils

Published online by Cambridge University Press:  09 July 2018

G. G. Ristori ,
S. Cecconi ,
V. Vidrich  and
G. Pacifici
G. G. Ristori
Affiliation:
Istituto di Chimica Agraria e Forestale dell'Università di Firenze, Centro di Studio per i Colloidi del Suolo del C.N.R., Piazzale delle Cascine, n° 28 50144-Firenze-Italy
S. Cecconi
Affiliation:
Istituto di Chimica Agraria e Forestale dell'Università di Firenze, Centro di Studio per i Colloidi del Suolo del C.N.R., Piazzale delle Cascine, n° 28 50144-Firenze-Italy
V. Vidrich
Affiliation:
Istituto di Chimica Agraria e Forestale dell'Università di Firenze, Centro di Studio per i Colloidi del Suolo del C.N.R., Piazzale delle Cascine, n° 28 50144-Firenze-Italy
G. Pacifici
Affiliation:
Istituto di Chimica Agraria e Forestale dell'Università di Firenze, Centro di Studio per i Colloidi del Suolo del C.N.R., Piazzale delle Cascine, n° 28 50144-Firenze-Italy
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Abstract

The chemical composition and structural characteristics of clays from samples of eight Tuscan soils were investigated. Using simple selective dissolution method (successive boiling in 1 N HCl and 0·5 N NaOH) it was possible to distinguish two types of low charge dioctahedral vermiculite; one easily HCl soluble the other practically insoluble.

Structural formulae for the soluble type were calculated from the chemical analysis of the dissolved material; for the insoluble type it was possible to calculate only an 'average' structural formula which included the micaceous material.

Since the HCl soluble vermiculites show a high content of Fe and Mg, they can be considered either as alteration products of glauconites or biotites, or as a result of a synthesis, at least in soils derived from basic rocks which do not contain mica.

The aluminous insoluble type, present also in parent material, may be the result of an incomplete 'illitization' in a marine environment.

Type
Research Article
Information
Clay Minerals , Volume 10 , Issue 4 , December 1974 , pp. 279 - 287
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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References

Alexiades, C.A. & Jackson, M.L. (1966) Clays Clay Miner. Proc. 14th Conf., p. 35. Pergamon Press, London.Google Scholar
Anderson, J.U. (1961) Clays Clay Miner. Proc. 10th Conf., p. 380. Pergamon Press, London.Google Scholar
Arnold, P.W. (1960) J. Sci. Fd Agric. 11, 285.Google Scholar
Barshad, I. (1960) Clays Clay Miner. Proc. 7th Conf., p. 350. Pergamon Press, London.Google Scholar
Barshad, I. & Kishk, F.M. (1969) Conn. Miner. Petrol. 24, 136.Google Scholar
Barshad, I. & Kishk, F.M. (1970) Clays Clay Miner. 18, 127.Google Scholar
Cecconi, S. & Polesello, A. (1955) Rie. Sci. 25, 98.Google Scholar
Cimbalnikova, A. (1971) Am. Miner. 56, 1385.Google Scholar
Cipriani, C. (1958) Atti. Soc. Tose. Sci. Nat. 65, 86 and 165.Google Scholar
Deer, W.A., Howie, R.A. & Zussman, J. (1962) Rock-forming Minerals. Longmans, London.Google Scholar
Gilkes, R.H., Young, R.G. & Quirk, H.P. (1972) Clays Clay Miner. 20, 303.CrossRefGoogle Scholar
Hower, J. & Mowatt, T.C. (1966) Am. Miner. 51, 825.Google Scholar
Kerns, R.L. & Mankin, C.J. (1967) Proc. 15th Conf., p. 163. Pergamon Press, London.Google Scholar
Malmani, P. (1966) Rend. Soc. Min. Ital. 22, 113.Google Scholar
Mehra, O.P. & Jackson, M.L. (1960) Clays Clay Miner. Proc. 7th Conf., p. 317. Pergamon Press, London.Google Scholar
Prudin, G. & King, H.G.C. (1969) Clay Miner. 8, 1.Google Scholar
Robert, M. & Pedro, G. (1969) Proc. Int. Clay Conf. Tokyo, 1, 455.Google Scholar
Walker, G.F. (1949) Min. Mag. 28, 693.Google Scholar