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Balangeroite

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Poggio San Vittore asbestos mine, Balangero - Corio area, Lanzo Massif, Lanzo Valley, Sesia-Lanzo zone, Torino Province, Piedmont, Italy
© GiovanniFraccaro

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Formula:
(Mg,Fe
2+
 
,Fe
3+
 
,Mn
2+
 
)
 
42
Si
 
16
O
 
54
(OH)
 
40
System:MonoclinicColour:Brown
Lustre:Vitreous
Name:Named for the type locality in the Balangero - Corio area, Torino Province, Piedmont, Italy.


Two polytypes are known, 2M and 1A (Bonaccorsi et al., 2012).

Classification of Balangeroite

IMA status:Approved
Strunz 8th edition ID:8/F.24-10
Nickel-Strunz 10th (pending) edition ID:9.DH.35

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
Dana 8th edition ID:65.3.2.1

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4
Hey's CIM Ref.:14.21.14

14 : Silicates not Containing Aluminum
21 : Silicates of Fe and Mg
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Type Occurrence of Balangeroite

Type Locality:Poggio San Vittore asbestos mine, Balangero - Corio area, Lanzo Massif, Lanzo Valley, Sesia-Lanzo zone, Torino Province, Piedmont, Italy
Year of Discovery:1983

Physical Properties of Balangeroite

Lustre:Vitreous
Colour:Brown

Crystallography of Balangeroite

Crystal System:Monoclinic
Cell Parameters:a = 19.4Å, b = 9.65Å, c = 19.4Å
β = 91.1°
Ratio:a:b:c = 2.01 : 1 : 2.01
Unit Cell Volume:V 3,631.20 ų (Calculated from Unit Cell)

Optical Data of Balangeroite

Type:Biaxial
RI values: nα = 1.680 nγ = 1.680
Maximum Birefringence:δ = 0.000

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v strong

Chemical Properties of Balangeroite

Formula:
(Mg,Fe
2+
 
,Fe
3+
 
,Mn
2+
 
)
 
42
Si
 
16
O
 
54
(OH)
 
40
Essential elements:H, Mg, O, Si
All elements listed in formula:Fe, H, Mg, Mn, O, Si
Common Impurities:Ti,Al,Cr,Ca

Relationship of Balangeroite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DH.05Leucophanite
NaCaBeSi
 
2
O
 
6
F
9.DH.10Ohmilite
Sr
 
3
(Ti,Fe
3+
 
)(Si
 
4
O
 
12
)(O,OH) · 2-3H
 
2
O
9.DH.15Haradaite
SrVSi
 
2
O
 
7
9.DH.15Suzukiite
BaVSi
 
2
O
 
7
9.DH.20Batisite
BaNaNaTi
 
2
(Si
 
4
O
 
12
)O
 
2
9.DH.20Shcherbakovite
(K,Ba)KNa(Ti,Nb)
 
2
(Si
 
4
O
 
12
)O
 
2
9.DH.25Taikanite
Sr
 
3
BaMn
2+
2
(Si
 
4
O
 
12
)O
 
2
9.DH.30Krauskopfite
BaSi
 
2
O
 
5
 · 3H
 
2
O
9.DH.35Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
9.DH.40Aenigmatite
Na
 
2
Fe
2+
5
Ti(Si
 
6
O
 
18
)O
 
2
9.DH.40Dorrite
Ca
 
4
(Mg
 
3
Fe
3+
9
)O
 
4
(Si
 
3
Al
 
8
Fe
3+
 
O
 
36
)
9.DH.40Høgtuvaite
(Ca,Na)
 
2
(Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|Be(Si,Al)
 
5
O
 
18
]
9.DH.40Krinovite
Na
 
2
Mg
 
4
Cr
3+
2
(Si
 
6
O
 
18
)O
 
2
9.DH.40Makarochkinite
Ca
 
2
Fe
2+
4
Fe
3+
 
Ti[O
 
2
|BeAlSi
 
4
O
 
18
]
9.DH.40Rhönite
Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|(Si,Al)
 
6
O
 
18
]
9.DH.40Serendibite
(Ca,Na)
 
2
(Mg,Fe
2+
 
)
 
3
(Al,Fe
3+
 
)
 
3
[O
 
2
|(Si,Al,B)
 
6
O
 
18
]
9.DH.40Welshite
Ca
 
4
Mg
 
9
Sb
 
3
O
 
4
[Si
 
6
Be
 
3
AlFe
 
2
O
 
36
]
9.DH.40Wilkinsonite
Na
 
2
Fe
2+
4
Fe
3+
2
(Si
 
6
O
 
18
)O
 
2
9.DH.45Sapphirine
(Mg,Fe)
 
4-x
Al
 
4+x
[Al
 
4+x
Si
 
2-x
O
 
18
]O
 
2
9.DH.50Khmaralite
(Mg,Al,Fe)
 
16
[(Al,Si,Be)
 
12
O
 
36
]O
 
4
9.DH.55Surinamite
(Mg,Fe)
 
3
Al
 
4
BeSi
 
3
O
 
16
9.DH.60Deerite
(Fe,Mn)
 
6
(Fe,Al)
 
3
[Si
 
6
O
 
17
]O
 
3
(OH)
 
5
9.DH.65Howieite
Na(Fe,Mn)
 
10
(Fe,Al)
 
2
Si
 
12
O
 
31
(OH)
 
13
9.DH.65Taneyamalite
(Na,Ca)(Mn,Mg,Fe)
 
12
Si
 
12
(O,OH)
 
44
9.DH.70Johninnesite
Na
 
2
Mn
2+
9
Mg
 
7
(OH)
 
8
[AsO
 
4
]
 
2
[Si
 
6
O
 
17
]
 
2
9.DH.75Agrellite
NaCa
 
2
Si
 
4
O
 
10
F
Related Minerals - Hey's Index Grouping:

- +
14.21.1Olivine
(Mg,Fe
2+
 
)
 
2
SiO
 
4
14.21.2Ringwoodite
(Mg,Fe
2+
 
)
 
2
SiO
 
4
14.21.3Wadsleyite
(Mg,Fe
2+
 
)
 
2
(SiO
 
4
)
14.21.4Clinoferrosilite
Fe
2+
 
SiO
 
3
14.21.5Anthophyllite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.21.6Cummingtonite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.21.7 Magnesiocummingtonite
14.21.8Grunerite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.21.9Minnesotaite
(Fe,Mg)
 
3
(Si
 
4
O
 
10
)(OH)
 
2
14.21.10Chesterite
(Mg,Fe)
 
17
Si
 
20
O
 
54
(OH)
 
6
14.21.11Jimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
14.21.12Clinojimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
14.21.13Majorite
Mg
 
3
(Fe
2+
 
,Si,Al)
 
2
(SiO
 
4
)
 
3

Other Names for Balangeroite

Synonyms:
IMA1982-002
Other Languages:
German:Balangeroit
Spanish:Balangeroita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Balangeroite

Reference List:

- +
Compagnoni, R., G. Ferraris, and L. Fiori (1983): Balangeroite, a new fibrous silicate related to gageite from Balangero, Italy. American Mineralogist, 68, 214-219.

Ferraris, G., M. Mellini, and S. Merlino (1987): Electron-diffraction and electron-microscopy study of balangeroite and gageite: crystal structures, polytypism, and fiber texture. American Mineralogist, 72, 382-391.

Belluso, E. and G. Ferraris (1991): New data on balangeroite and carlosturanite from alpine serpentinites. Eur. J. Mineral., 3, 559-566.

Bonaccorsi, E., Ferraris, G., Merlino, S. (2012): Crystal structure of 2M and 1A polytypes of balangeroite. Zeitschrift für Kristallographie, 227, 460-467.

Internet Links for Balangeroite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Balangeroite details from Handbook of Mineralogy (PDF)
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    • Localities for Balangeroite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Italy
     
    • Piedmont
      • Torino Province
        • Sesia-Lanzo zone
          • Lanzo Valley
            • Lanzo Massif
              • Balangero - Corio area
    		1) Compagnoni, R., Ferraris, G., Fiora, L. (1983): Balangeroite, a new fibrous silicate related to gageite from Balangero. American Mineralogist, 67, 214-219. 2) Prete, R. (1995): L'amiantifera di S. Vittore, Balangero, Torino. Rivista Mineralogica Italiana, 4/1995, 313-333.
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