Brokenhillite Mineral Data

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:

r_electron=6.21 gm/cc
note: r_{Brokenhillite}=6.42 gm/cc.

Fermion Index

Fermion Index = 0.00972
Boson Index = 0.99028

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Brokenhillite is Not Radioactive

Brokenhillite Classification

Dana Class:

65.0.0.0 (65)Inosilicate Minerals

(65.0)Without Dana Classification Numbers

(Pyrosmalite group)

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

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 - 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: