Mineralogy Database

Brokenhillite Mineral Data

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General Brokenhillite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Fe)32[Si24O60]OH29Cl11
Help on Composition: Composition: Molecular Weight = 4,282.50 gm
   Manganese  30.79 %  Mn   39.75 % MnO
   Iron       10.43 %  Fe   13.42 % FeO
   Silicon    15.74 %  Si   33.67 % SiO2
   Hydrogen    0.68 %  H     6.10 % H2O
   Chlorine    9.11 %  Cl    9.11 % Cl
                -   %   Cl   -2.05 % -O=Cl2   
   Oxygen     33.25 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+24Fe2+8Si24O60(OH)29Cl11
Help on Environment: Environment: Discredited as being manganpyrosmalite which has priority.
Help on IMA Status: IMA Status: Not Approved IMA
Help on Locality: Locality: Broken Hill, New South Wales, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.

Brokenhillite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.04472
Help on Cell Dimensions: Cell Dimensions: a = 13.481, c = 14.084, Z = 2; V = 2,216.67 Den(Calc)= 6.42
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Pyramidal H-M Symbol (6mm) Space Group: P 63mc

Physical Properties of Brokenhillite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Brown.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Streak: Streak: light brown

Optical Properties of Brokenhillite

Help on Optical Data: Optical Data: NCalc= 2.43 - from Gladstone-Dale relationship (KC = 0.2231) where Ncalc=Dcalc*KC+1

Calculated Properties of Brokenhillite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.21 gm/cc
note: Specific Gravity of Brokenhillite =6.42 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0097227741
Boson Index = 0.9902772259
Help on Photoelectric: Photoelectric: PEBrokenhillite = 12.22 barns/electron
U=PEBrokenhillite x rElectron Density= 75.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brokenhillite is Not Radioactive

Brokenhillite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Minerals
  (65.00)Without Dana Classification Numbers
  (65.00.00)Pyrosmalite group Ashcroftine-(Ce)* K5Na5(Ce,Ca)12Si28O70(OH)2(CO3)8•8(H2O) I 4/mmm 4/m 2/m 2/m Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 63mc 6mm Grossmanite CaTiAlSiO6 C 2/m 2/m Hypersthene? (Mg,Fe)2Si2O6 2/m 2/m 2/m IMA2007-015 K(CaNa)(Fe3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m IMA2008-070 NaLi2(Fe2Al2Li)(Si6Al2)O22F2 C 2/m 2/m IMA2009-010 [Ba6(PO4)2(CO3)][Fe7(OH)4Fe2O2(SiO3)8] P1 1 IMA2009-012 NaNa2(Mg2Al2Li)Si8O22F2 C 2/m 2/m Kushiroite CaAl2SiO6 C 2/c 2/m Plumalsite* Pb4Al2(SiO3)7(?) Unk Ortho
Help on  Strunz Class: Strunz Class: 09.EE.10 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.10 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 63mc 6mm
09.EE.10 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m
09.EE.10 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m
09.EE.10 Pyrosmalite-(Fe) (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m
09.EE.10 Pyrosmalite-(Mn) (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

Other Brokenhillite Information

Help on References: References: PHYS. PROP.(Am.Min.,Vol.74,p1399,1989)
Help on See Also: See Also: Links to other databases for Brokenhillite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 09.EE.10





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