Brokenhillite Mineral Data

General Brokenhillite Information

Chemical Formula:

(Mn,Fe)32[Si24O60]OH29Cl11

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

Empirical Formula:

Mn²⁺₂₄Fe²⁺₈Si₂₄O₆₀(OH)₂₉Cl₁₁

Environment:

Discredited as being manganpyrosmalite which has priority.

IMA Status:

Not Approved IMA

Locality:

Broken Hill, New South Wales, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

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Brokenhillite Crystallography

Axial Ratios:

a:c = 1:1.04472

Cell Dimensions:

a = 13.481, c = 14.084, Z = 2; V = 2,216.67 Den(Calc)= 6.42

Crystal System:

Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 6₃mc

Physical Properties of Brokenhillite

Cleavage:

{???} Good

Color:

Brown.

Hardness:

4-5 - Fluorite-Apatite

Streak:

light brown

Optical Properties of Brokenhillite

Optical Data:

NCalc= 2.43 - from Gladstone-Dale relationship (KC = 0.2231) where Ncalc=Dcalc*KC+1

Calculated Properties of Brokenhillite

Electron Density:

Bulk Density (Electron Density)=6.21 gm/cc
note: Specific Gravity of Brokenhillite =6.42 gm/cc.

Fermion Index:

Fermion Index = 0.0097227741
Boson Index = 0.9902772259

Photoelectric:

PE_{Brokenhillite}= 12.22 barns/electron
U=PE_{Brokenhillite} x rElectron Density= 75.92 barns/cc.

Radioactivity:

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

Brokenhillite Classification

Dana Class:

65.00.00.00 (65)Inosilicate Minerals

(65.00)Without Dana Classification Numbers

(65.00.00)Pyrosmalite group

65.00.00.00 Ashcroftine-(Ce)* K5Na5(Ce,Ca)12Si28O70(OH)2(CO3)8•8(H2O) I 4/mmm 4/m 2/m 2/m

65.00.00.00 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 6₃mc 6mm

65.00.00.00 Grossmanite CaTiAlSiO6 C 2/m 2/m

65.00.00.00 Hypersthene? (Mg,Fe)2Si2O6 2/m 2/m 2/m

65.00.00.00 IMA2007-015 K(CaNa)(Fe3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m

65.00.00.00 IMA2008-070 NaLi2(Fe2Al2Li)(Si6Al2)O22F2 C 2/m 2/m

65.00.00.00 IMA2009-010 [Ba6(PO4)2(CO3)][Fe7(OH)4Fe2O2(SiO3)8] P1 1

65.00.00.00 IMA2009-012 NaNa2(Mg2Al2Li)Si8O22F2 C 2/m 2/m

65.00.00.00 Kushiroite CaAl2SiO6 C 2/c 2/m

65.00.00.00 Plumalsite* Pb4Al2(SiO3)7(?) Unk Ortho

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

References:

PHYS. PROP.(Am.Min.,Vol.74,p1399,1989)

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

Brokenhillite

(Mn,Fe)32[Si24O60]OH29Cl11
Dana No: 65.00.00.00 Strunz No: 09.EE.10
Locality:

Notes: