Balangeroite Mineral Data

General Balangeroite Information

Chemical Formula:

(Mg,Fe+++,Fe++,Mn++)42Si16O54(OH)40

Composition:

Molecular Weight = 3,377.84 gm

Magnesium 19.21 % Mg 31.86 % MgO

Manganese 2.76 % Mn 3.57 % MnO

Iron 19.51 % Fe 17.02 % FeO / 8.98 % Fe₂O₃

Silicon 13.30 % Si 28.46 % SiO₂

Hydrogen 1.11 % H 9.95 % H₂O

Oxygen 44.10 % O

______ ______

100.00 % 99.83 % = TOTAL OXIDE

Empirical Formula:

Mg_26.7Fe²⁺₈Fe³⁺_3.8Mn²⁺_1.7Si₁₆O_55.8(OH)_37.3

Environment:

In shistose serpentinite in proximity to a large ultramafic massif.

IMA Status:

Approved IMA 1983

Locality:

Balangero (San Vittore) mine, Piedmont, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Balangeroite + Pronunciation

Balangeroite Image

Images:

Balangeroite

Comments: Brown fiberous crystals of balangeroite in metamorphic shist.
Location: Mt. S,Vittore, Balangero, Piedmont, Italy. Scale: 5 1/2" x 2 1/4".
© Chris Wright / Wrights Rock Shop

Balangeroite Crystallography

Axial Ratios:

a:b:c =1:1:0.4974

Cell Dimensions:

a = 19.4, b = 19.4, c = 9.65, Z = 2; beta = 88.9° V = 3,631.20 Den(Calc)= 3.09

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.714(1), 6.77(0.8), 2.674(0.75),3.378(0.45), 2.516(0.4), 3.278(0.4), 9.59(0.4),

Physical Properties of Balangeroite

Cleavage:

{???} Very Good, {???} Very Good

Color:

Brownish yellow, Dark brown.

Density:

2.96 - 3.1, Average = 3.03

Diaphaneity:

Subtranslucent to Opaque

Habit:

Fibrous - Crystals made up of fibers.

Luster:

Vitreous - Greasy

Streak:

brownish white

Optical Properties of Balangeroite

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2201,KPDmeas= 0.2244,KC= 0.2241
Ncalc = 1.66 - 1.69

Optical Data:

Biaxial (?), a=1.68, g=1.68, bire=0.0000

Pleochroism (x):

dark brown.

Pleochroism (z):

yellow brown.

Calculated Properties of Balangeroite

Electron Density:

Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Balangeroite =3.03 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Balangeroite= 7.38 barns/electron
U=PE_Balangeroite x rElectron Density= 22.18 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Balangeroite is Not Radioactive

Balangeroite Classification

Dana Class:

65.03.02.01 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.03)with chains P=4

(65.03.02)Gageite group

65.03.02.01 Balangeroite (Mg,Fe,Fe,Mn)42Si16O54(OH)40 P 2/n 2/m

65.03.02.02a Gageite-2M (Mn,Mg,Zn)42Si16O54(OH)40 P 2/n 2/m

65.03.02.02b Gageite (Mn,Mg,Zn)42Si16O54(OH)40 P1 1

Strunz Class:

09.DH.35 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DH -Inosilicates with 4-periodic single chains, Si4O12

09.DH.35 Balangeroite (Mg,Fe,Fe,Mn)42Si16O54(OH)40 P 2/n 2/m

09.DH.35 Gageite-2M (Mn,Mg,Zn)42Si16O54(OH)40 P 2/n 2/m

09.DH.35 Gageite (Mn,Mg,Zn)42Si16O54(OH)40 P1 1

Other Balangeroite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Balangeroite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Balangeroite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Balangeroite :

A Bijoux Google Search for Balangeroite
Adam's Minerals Google Search for Balangeroite
Cape Minerals Google Search for Balangeroite
Dakota Matrix Minerals Google Search for Balangeroite
Excalibur Mineral Corp. Google Search for Balangeroite
Exceptional Minerals Google Search for Balangeroite
John Betts Fine Minerals Search for Balangeroite
McDougall Minerals Google Search for Balangeroite
Mineral News Website Link
Rock and Mineral Shows Google Search for Balangeroite
Weinrich Minerals, Inc. Google Search for Balangeroite

Ask about Balangeroite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Balangeroite Specimen Label here :

Balangeroite

(Mg,Fe+++,Fe++,Mn++)42Si16O54(OH)40
Dana No: 65.03.02.01 Strunz No: 09.DH.35
Locality:

Notes: