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Acquanegra asbestos mines (Costòn d’Acquanegra; Acquanera asbestos mines), Lanzada, Lanterna Valley, Malenco Valley, Valtellina, Sondrio Province, Lombardy, Italy

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 46° 16' 9'' North , 9° 54' 8'' East (est.)
Margin of Error:~0km
Name(s) in local language(s):Miniere di amianto dell'Acquanegra (Costòn d’Acquanegra; Miniere di amianto dell'Acquanera), Lanzada, Val Lanterna, Valmalenco (Val Malenco), Valtellina, Sondrio, Lombardia, Italia
Other regions containing this locality:The Alps, Europe


Ancient asbestos mines, exploited in the XIX century and definitively abandoned in 1944, located at an elevation of about 2000 m on Costòn d’Acquanegra, the rocky edge lying along the western boundary of Alpe Largone Superiore plateau. Nowadays, all underground works are collapsed and minerals can be found only in the dumps.
Demantoid appears as swarms of very bright crystals, varying in colour from light green to pea green, on the walls of the serpentinite fissures. Sometimes, the crystals are embedded in calcite or asbestos. Furthermore, good demantoid crystals, varying in colour from olive green to green-yellowish, have been found on serpentinite blocks, fallen down from a large sub-vertical cleft situated in a rocky wall of Costòn d’Acquanegra, to the west of the altitude mark 2142 m (Bedognè, 1970 and 1979; Bedognè et al., 1995).
A large chromitite vein (about 70 cm thick and 10 m long), consisting of Cr-rich magnetite grains with a chromite core in association with violet chromian clinochlore, antigorite, brucite, and awaruite, has been almost completely removed as a consequence of excavation works performed by mineral collectors in search of chromian andradite inside its fissures (Bedognè et al., 1993; Sciesa, 1993).

Mineral List


12 valid minerals.

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References

Sigismund, P. (1948) Granato e vesuvianite in Val Malenco. Atti Soc. It. Sci. Nat., 87, 145-171.

Gramaccioli, C.M. (1962) I minerali valtellinesi nella raccolta di Pietro Sigismund. Ed. privata, Milano, 179 pp.

Bedognè, F. (1970) Località di ritrovamento dei demantoidi. In: Boscardin, M., De Michele, V., Scaini, G. Itinerari mineralogici della Lombardia. Ed. Museo Civ. St. Nat. e Soc. It. Sci. Nat., Milano, 77-80.

Amthauer, G., Kurtz, W., Rost, F., Schloemer, H. (1974) Chemismus und Genese des Andradits aus dem Serpentinit des Val Malenco (Bernina-Gebiet/Oberitalien). Schweiz. Miner. Petr. Mitt., 54, 691-706.

De Michele, V. (1974) Guida mineralogica d'Italia. Ed. De Agostini, Novara, 2 vol., 408 pp.

Gramaccioli, C.M. (1975) Minerali alpini e prealpini. Istituto Italiano Edizioni Atlas, Bergamo, 2 vol., 472 pp.

Bedognè, F. (1979) Itinerari mineralogici. Valmalenco e media Valtellina. Ed. Comunità Montana Valtellina-Ass. Turismo, Sondrio, 63 pp.

Bedognè, F. (1980) Die Mineralien der Grüngesteine des Val Malenco. Lapis, 1980/6, 9-13.

Bedognè, F., and Sciesa, E. (1993) Die Demantoide vom Val Malenco, Sondrio, Italien. Mineralien Welt, 1993/6, 25-28.

Bedognè, F., Montrasio, A., Sciesa, E. (1993) I minerali della provincia di Sondrio: Valmalenco. Bettini, Sondrio, 275 pp.

Sciesa, E. (1993) Le cromititi della Valmalenco (Alpi Centrali). Il Naturalista Valtellinese - Atti Mus. civ. Stor. nat. Morbegno, 4, 3-9.

Bedognè, F., and Sciesa, E. (1994) Asbestklüfte und ihre Mineralien im Serpentinit des Val Malenco (Sondrio, Italien). Mineralienfreund, 1994/4, 13-19.

Benetti, F. (1994) Guida mineralogica della Val Malenco. Grafica Mevio, Sondrio, 203 pp.

Bedognè, F., Sciesa, E., Vignola, P. (1999) Il “demantoide” della Valmalenco. Riv. Miner. It., 23, 4, 208-217.

Bedognè, F., Montrasio, A., Sciesa, E. (2006) I minerali della media-alta Valtellina, delle Orobie valtellinesi e della Val Poschiavo. Aggiornamenti sulle altre località della provincia di Sondrio. Bettini, Sondrio, 255 pp.

 
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