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Mineralpedia Details for Balangeroite

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Balangeroite

Balangeroite

Named for the type and only locality at in the Balangero-Corino area at the Poggio San Vittore asbestos mine in Piedmont, Italy. Balangeroite is found in schistose serpentinite near a large ultramific massif, and in association with chrysotile, magnetite, iron-nickel alloys, olivenite, titanian clinohumite, diopside, antigorite, calcite, aragonite, opal, chalcedony, and clay minerals.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/balangeroite.pdf

Formula
Mg21Si8O27(OH)20 
Crystal System
Monoclinic 
Crystal Habit
Fibrous 
Cleavage
Very Good, Very Good, None 
Luster
Vitreous - Greasy 
Color
brownish yellow, dark brown 
Streak
brownish white 
Class
Monoclinic - Prismatic 
Hardness
WebMineral
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Mindat
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Balangeroite from Balangero, Lanzo Valley, Piemonte, Italy

Balangeroite
            from Balangero, Lanzo Valley, Piemonte, Italy
Special Info
Type Locality

Orange-brown fibrous crystals. This is a "Co-Type" specimen given to Don Cooke by Bill Pinch. Balangeroite was discovered in 1977 by Enrico Beccuti. The type specimen resides at the Turin University museum. It is found in the Balagero serpintine.

Attractive and beautiful spay of  fibrous Balangeroite to 2.5cm (last two shots).

Click thumbnail images for larger view.

Balangeroite from Poggio San Vittore Mine, Lanzo Valley, Piedmont, Italy

Balangeroite
            from Poggio San Vittore Mine, Lanzo Valley, Piedmont, Italy
Special Info
Type Locality

Slender golden, fibrous crystals to 4.5cm. Balangeroite is a rare inosilicate found in schistose serpentinite in proximity to a large ultramafic massif. It is a one-locality mineral.

Click thumbnail images for larger view.

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