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Balangeroite

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About BalangeroiteHide

Formula:
(Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40
Colour:
Brown
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
Named for the type locality in the Balangero - Corio area, Torino Province, Piedmont, Italy.
Isostructural with:
Two polytypes are known, 2M and 1A (Bonaccorsi et al., 2012).


Classification of BalangeroiteHide

Approved
9.DH.35

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
65.3.2.1

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4
14.21.14

14 : Silicates not Containing Aluminum
21 : Silicates of Fe and Mg

Physical Properties of BalangeroiteHide

Vitreous
Colour:
Brown

Optical Data of BalangeroiteHide

Type:
Biaxial
RI values:
nα = 1.680 nγ = 1.680
Max Birefringence:
δ = 0.000
Image 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 BalangeroiteHide

Formula:
(Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40
IMA Formula:
Mg21Si8O27(OH)20
Common Impurities:
Ti,Al,Cr,Ca

Crystallography of BalangeroiteHide

Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Balangeroite-1ABalangeroite-2M
  
Triclinic Monoclinic 
1 - Pinacoidal2/m - Prismatic
P1 
  
a = 9.602 Å, b = 13.891 Å, c = 14.012 Å
α = 86.99°, β = 76.79°, γ = 76.67°
a = 19.179 Å, b = 9.601 Å, c = 19.218 Å
β = 90.52°
a:b:c = 0.691 : 1 : 1.009a:b:c = 1.998 : 1 : 2.002
V 1,770.47 ų
(Calculated from Unit Cell)
V 3,538.61 ų
(Calculated from Unit Cell)
  

Type Occurrence of BalangeroiteHide

Synonyms of BalangeroiteHide

Other Language Names for BalangeroiteHide

Related Minerals - Nickel-Strunz GroupingHide

9.DH.05LeucophaniteNaCaBeSi2O6FOrth. 2 2 2 : P21 21 21
9.DH.10OhmiliteSr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2OMon.
9.DH.15HaradaiteSrVSi2O7Orth.
9.DH.15SuzukiiteBaVSi2O7Orth.
9.DH.20BatisiteBaNaNaTi2(Si4O12)O2Orth.
9.DH.20Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2Orth.
9.DH.25TaikaniteSr3BaMn2+2(Si4O12)O2Mon.
9.DH.30KrauskopfiteBaSi2O5 · 3H2OMon.
9.DH.35GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
9.DH.40AenigmatiteNa4[Fe2+10Ti2]O4[Si12O36]Tric. 1 : P1
9.DH.40DorriteCa4(Mg3Fe3+9)O4(Si3Al8Fe3+O36)Tric.
9.DH.40HøgtuvaiteCa4[Fe2+6Fe3+6]O4[Si8Be2Al2O36]Tric. 1 : P1
9.DH.40KrinoviteNa2Mg4Cr3+2(Si6O18)O2Tric.
9.DH.40Makarochkinite(Ca,Na)2Fe2+4Fe3+Ti[O2|BeAlSi4O18]Tric. 1 : P1
9.DH.40RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]Tric. 1 : P1
9.DH.40SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
9.DH.40WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]Tric. 1 : P1
9.DH.40WilkinsoniteNa2Fe2+4Fe3+2(Si6O18)O2Tric. 1 : P1
9.DH.45SapphirineMg4(Mg3Al9)O4[Si3Al9O36]Mon. 2/m : P21/b
9.DH.50Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4Mon. 2/m : P21/b
9.DH.55Surinamite(Mg,Fe)3Al4BeSi3O16Mon.
9.DH.60Deerite(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5Mon.
9.DH.65HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13Tric.
9.DH.65Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44Tric.
9.DH.70JohninnesiteNa2Mn2+9Mg7(OH)8[AsO4]2[Si6O17]2Tric.
9.DH.75AgrelliteNaCa2Si4O10FTric.

Related Minerals - Dana Grouping (8th Ed.)Hide

65.3.2.2aGageite-2M(Mn,Mg,Zn)42Si16O54(OH)40Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.21.1OlivineOrth.
14.21.2Ringwoodite(Mg,Fe2+)2SiO4Iso. m3m (4/m 3 2/m) : Ia3d
14.21.3Wadsleyite(Mg,Fe2+)2(SiO4)Orth.
14.21.4ClinoferrosiliteFe2+SiO3Mon. 2/m : P21/b
14.21.5Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
14.21.6Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2Mon.
14.21.7 Magnesiocummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
14.21.8Grunerite☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2Mon. 2/m : B2/m
14.21.9MinnesotaiteFe2+3Si4O10(OH)2Tric. 1 : P1
14.21.10Chesterite(Mg,Fe)17Si20O54(OH)6Orth.
14.21.11Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca
14.21.12Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2Mon.
14.21.13MajoriteMg3(Fe2+,Si,Al)2(SiO4)3Iso.

Other InformationHide

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

References for BalangeroiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 BalangeroiteHide

Localities for BalangeroiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy
 
  • Piedmont
    • Torino Province
      • Ceronda Valley
        • Varisella
Belluso, E., Compagnoni, R., Ferraris, G. (1995): Occurrence of asbestiform minerals in the serpentinites of the Piemonte zone, western Alps. “Giornata di studio in ricordo del Prof. Stefano Zucchetti”, Politecnico di Torino, Dipartimento Georisorse e Territorio, 12 Maggio 1994. Contribution volume, Tipolitografia Edicta, Torino, 57-66.
      • Lanzo Valleys
        • Balangero
Compagnoni, R., Ferraris, G., and Fiora, L. (1983) Balangeroite, a new fibrous silicate related to gageite from Balangero. American Mineralogist, 67, 214-219.; Prete, R. (1995) L'amiantifera di S. Vittore, Balangero, Torino. Rivista Mineralogica Italiana, 4/1995, 313-333.
        • Lanzo Torinese
Belluso, E., Compagnoni, R., Ferraris, G. (1995): Occurrence of asbestiform minerals in the serpentinites of the Piemonte zone, western Alps. “Giornata di studio in ricordo del Prof. Stefano Zucchetti”, Politecnico di Torino, Dipartimento Georisorse e Territorio, 12 Maggio 1994. Contribution volume, Tipolitografia Edicta, Torino, 57-66.
Mineral and/or Locality  
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