Brokenhillite Mineral Data

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.
 

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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 PyramidalH-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:

relectron=6.21 gm/cc
note: rBrokenhillite =6.42 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00972
Boson Index = 0.99028
Help on Photoelectric: Photoelectric:

PEBrokenhillite = 12.22 barns/electron
U=PEBrokenhillite x relectron= 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: 65.0.0.0 (65)Inosilicate Minerals
  (65.0)Without Dana Classification Numbers
  (Pyrosmalite group)
Help on  Strunz Class: Strunz Class: VIII/H.28-30 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others
  VIII/H.28 - Pyrosmalite series
 
VIII/H.28-10 Ferropyrosmalite (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m
 
VIII/H.28-20 Manganpyrosmalite (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m
 
VIII/H.28-30 Brokenhillite (Mn,Fe)32[Si24O60]OH29Cl11 P 63mc 6mm
 
VIII/H.28-40 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m
 
VIII/H.28-50 Schallerite Mn16[AsO2OH][Si12O30](OH)14 P 3m1 ? 3m
 
VIII/H.28-70 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m
 
VIII/H.28-80 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m
 
VIII/H.28-90 Bementite Mn8Si6O15(OH)10 P 21/c 2/m
 
VIII/H.28-100 Varennesite Na8Mn2Si10O25(OH,Cl)2·12(H2O) C mcm 2/m 2/m 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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Brokenhillite

(Mn,Fe)32[Si24O60]OH29Cl11
Dana No: Unknown Strunz No: VIII/H.28-30
Locality:

 

Notes:

 

 
   
 
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