Ferrokinoshitalite Mineral Data

General Ferrokinoshitalite Information

Chemical Formula:

(Ba,K)(Fe++,Mg)3(Si2Al2)O10 (OH,F)2

Composition:

Molecular Weight = 526.29 gm

Potassium 2.97 % K 3.58 % K₂O

Barium 13.05 % Ba 14.57 % BaO

Magnesium 4.62 % Mg 7.66 % MgO

Aluminum 7.69 % Al 14.53 % Al₂O₃

Iron 21.22 % Fe 27.30 % FeO

Silicon 13.34 % Si 28.54 % SiO₂

Hydrogen 0.26 % H 2.31 % H₂O

Oxygen 34.50 % O

Fluorine 2.35 % F 2.35 % F

- % F -0.99 % -O=F₂

______ ______

100.00 % 99.85 % = TOTAL OXIDE

Empirical Formula:

Ba_0.5K_0.4Fe²⁺₂MgSi_2.5Al_1.5O₁₀(OH)_1.35F_0.65

Environment:

Found in metamorphosed exhalative sedimentary rocks (banded iron-formations) enclosing the massive Pb-Zn-Cu-Ag sulfide orebodies. The polytype in the type material is 1M. A member o f the Brittle Mica group.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Broken Hill mine, near Aggeneys, northern Cape Province, South Africa. Link to MinDat.org Location Data.

Name Origin:

The name reflects the mineralï¿½s iron content and relationship to kinoshitalite.

Synonym:

IMA1999-026

Ferrokinoshitalite Crystallography

Axial Ratios:

a:b:c =0.5771:1:1.0767

Cell Dimensions:

a = 5.389, b = 9.337, c = 10.054, Z = 2; beta = 100.53° V = 497.37 Den(Calc)= 3.51

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.651(1)(131,200), 2.176(0.4)(133,202), 2.181(0.4), 1.551(0.3)(060m331), 1.529(0.25)(206), 1.659(0.25)(135,313

Physical Properties of Ferrokinoshitalite

Cleavage:

{001} Perfect

Color:

Dark green.

Density:

3.69

Diaphaneity:

Translucent

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Optical Properties of Ferrokinoshitalite

Gladstone-Dale:

CI meas= 0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1956,KPDmeas= 0.1861,KC= 0.1907
Ncalc = 1.67 - 1.7

Optical Data:

Biaxial (-), a=1.68, b=1.68, g=1.7, bire=0.0200, 2V(Calc)=0, 2V(Meas)=20. Dispersion Calculated.

Calculated Properties of Ferrokinoshitalite

Electron Density:

Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Ferrokinoshitalite =3.69 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Ferrokinoshitalite}= 62.21 barns/electron
U=PE_{Ferrokinoshitalite} x r_electron= 219.92 barns/cc.

Radioactivity:

GRapi = 41.06 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferrokinoshitalite per GRapi unit = 2.44 (%)

Estimated Radioactivity from Ferrokinoshitalite - barely detectable

Ferrokinoshitalite Classification

Dana Class:

71.02.02c.06 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.02)with 2:1 Layers

(71.02.02c)Mica Group (Margarite subgroup)

71.02.02c.01 Margarite CaAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.02.02c.02 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m

71.02.02c.03 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m

71.02.02c.04 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m

71.02.02c.05 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m

71.02.02c.06 Ferrokinoshitalite! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m

71.02.02c.07 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m

71.02.02c.08 Oxykinoshitalite! (Ba,K)(Mg,Fe,Ti)3(Si,Al)4O10O2 C 2/m 2/m

Strunz Class:

09.EC.35 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.35 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m

09.EC.35 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m

09.EC.35 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m

09.EC.35 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m

09.EC.35 Ferrokinoshitalite! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m

09.EC.35 Oxykinoshitalite! (Ba,K)(Mg,Fe,Ti)3(Si,Al)4O10O2 C 2/m 2/m

Other Ferrokinoshitalite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(AmMin, vol 85, p 1561) OPTIC PROP.(AmMin, vol 85, p 1561)

See Also:

Links to other databases for Ferrokinoshitalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ferrokinoshitalite

(Ba,K)(Fe++,Mg)3(Si2Al2)O10 (OH,F)2
Dana No: 71.02.02c.06 Strunz No: 09.EC.35
Locality:

Notes:

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