Cava Vispi, San Venanzo, Marsciano, Terni, Umbria, Italia
Olivine-leucite pegmatoid melilitolite veinlets (dykes) swarm.
Located near Marsciano.
The San Venanzo carbonatite comprises the two maars and tuff rings of San Venanzo and Pian di Celle, and the small cone of Celli. The area consists of crystal and lapilli tuffs with abundant melilitite bombs, and there are also two lava flows at Pian di Celle. Celli is a lapilli tuff cone, erosion of which has exposed a cylindrical conduit filled with tuffisite. The pyroclastic rocks of the volcano vary from phonolitic to melilititic amongst which are units with varying proportions of primary calcite. The last comprise layers that almost totally consist of very fine-grained calcite in which occur sparse glass fragments and melilitic lapilli. The lava flows consist of kalsilite-phlogopite-olivine leucite melilitite (venanzite). Volcanic activity at San Venanzo has been dated by 39Ar-40Ar at 265,000 years.
The following phases are with specific properties:
Bartonite-chlorbartonite series
Cuspidine var. Na-Zr-rich cuspidine
Kirchsteinite var. Mg-rich kirchsteinite
Magnesioferrite var. Cr-rich magnesioferrite
Monticellite var. Fe-rich monticellite
Mineral List
55 entries listed. 43 valid minerals. 2 type localities (valid minerals).
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References
- Mittempergher, M. (1965) - Vulcanismo e petrogenesi nella zona di S. Venanzo (Umbria) - Atti Soc. Toscana di Sc. Nat. , Pisa, vol. 72, pp. 437-479.
- Turi, B. (1968) - La composizione isotopica dell'ossigeno e del carbonio dei carbonati presenti nelle vulcaniti di S. Venanzo (Umbria). Periodico di mineralogia – Roma, pp. 589-603.
- Cingolani, G. (1974) - Eccezionali cristalli di Kalsilite a S. Venanzo (Umbria) - Notizie del Gruppo Min. Lombardo, Fasc. 3, Sept. 1974 - Milano, pp. 66-67.
- De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 volumes.
- Peacor, D.R., P.J. Dunn, W.B. Simmons, E. Tillmanns, and R.X. Fischer
(1984) Willhendersonite, a new zeolite isostructural with chabazite. Amer. Mineral., 69, 186- 89.
- Meli R. (1997): Giacimenti da non dimenticare: i minerali delle vulcaniti di San Venanzo (Terni). Riv. Miner. Ital. n.3, pagg. 269-275.
- Stoppa, F., Sharygin, V.V., and Cundari, A. (1997): New mineral data from the kamafugite-carbonatite association: the melilitolite from Pian di Celle, Italy. Mineralogy and Petrology 61, 27-45.
- Stoppa, F., and Woolley, A.R. (1997): The Italian carbonatites: field occurrence, petrology and regional significance. Mineralogy and Petrology 59, 43-67.
- Stoppa, F., Woolley, A.R., and Bayley, K. (2004): Extrusive carbonatites and their meaning: the case of Italy. 32° Intern. Geol. Congr., Firenze 2004. Post Congress BW02, APAT Ed., pp. 3-24.
- Preite, D. & Gatta, G.D. (2011): Kalsilite di San Venanzo - analisi e considerazioni. Micro, 9, 43-45.
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