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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
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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

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Footnotes

*

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

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