Ferrokentbrooksite Mineral Data

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General Ferrokentbrooksite Information

Chemical Formula:

Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2

Composition:

Molecular Weight = 3,231.96 gm

Potassium 0.39 % K 0.47 % K₂O

Sodium 9.28 % Na 12.51 % Na₂O

Strontium 0.41 % Sr 0.48 % SrO

Calcium 5.98 % Ca 8.36 % CaO

La,Ce,Pr,Nd,Sm, 4.41 % RE 5.15 % REE₂O₃

Yttrium 0.47 % Y 0.59 % Y₂O₃

Hafnium 0.17 % Hf 0.20 % HfO₂

Zirconium 8.67 % Zr 11.70 % ZrO₂

Tantalum 0.11 % Ta 0.14 % Ta₂O₅

Titanium 0.06 % Ti 0.10 % TiO₂

Manganese 3.14 % Mn 4.06 % MnO

Niobium 1.84 % Nb 2.63 % Nb₂O₅

Aluminum 0.06 % Al 0.11 % Al₂O₃

Iron 4.13 % Fe 5.31 % FeO

Silicon 21.86 % Si 46.77 % SiO₂

Hydrogen 0.04 % H 0.33 % H₂O

Chlorine 0.98 % Cl 0.98 % Cl

- % Cl -0.22 % -O=Cl₂

Oxygen 37.13 % O

Fluorine 0.89 % F 0.89 % F

- % F -0.37 % -O=F₂

______ ______

100.00 % 100.19 % = TOTAL OXIDE

Empirical Formula:

Na_13.05REE_0.99K_0.32Ca_0.23Sr_0.15Ca_4.59Mn²⁺_1.24Y_0.17Fe²⁺_2.39Mn²⁺_0.61Zr₃Ti_0.04Hf_0.03 Nb_0.64Si_0.23Zr_0.07Ta_0.02Si_24.93Al_0.07(OH)_0.4

Environment:

Primary late-stage phase in a small pegmatite dike in nepheline syenite.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named as the Fe-analogue of kentbrooksite.

Synonym:

IMA1999-046

Ferrokentbrooksite Image

Images:

Ferrokentbrooksite

Comments: A crystal of red ferrokentbrooksite in matrix.
Location: Mont Saint-Hilaire, Quebec. Scale: Crystal size 1.5 mm.
© László Horváth

Ferrokentbrooksite Crystallography

Axial Ratios:

a:c = 1:2.10764

Cell Dimensions:

a = 14.2277, c = 29.987, Z = 3; V = 5,256.94 Den(Calc)= 3.06

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 2.968(1)(315), 2.847(0.98)(404), 3.391(0.51)(131),5.694(0.5)(202), 4.3(0.43)(205), 7.104(0.38)(110), 3.155(0.31)(217), 3.207(0.31)(208), 3.955(0.31)(214),

Physical Properties of Ferrokentbrooksite

Cleavage:

None

Color:

Reddish brown, Red.

Density:

3.06

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Equant Grains - Granular material with equel dimensions in x, y, and z.

Habit:

Pseudo Octohedral - Crystals show an octohedral outline.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ferrokentbrooksite

Gladstone-Dale:

CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2027,KPDmeas= 0.2027,KC= 0.2034
Ncalc = 1.62

Optical Data:

Uniaxial (-), e=1.6186, w=1.6221, bire=0.0035.

Calculated Properties of Ferrokentbrooksite

Electron Density:

Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Ferrokentbrooksite =3.06 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Ferrokentbrooksite}= 47.82 barns/electron
U=PE_{Ferrokentbrooksite} x r_electron= 141.60 barns/cc.

Radioactivity:

GRapi = 4,574.68 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferrokentbrooksite per GRapi unit = 218.59 (PPM)

Ferrokentbrooksite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Ferrokentbrooksite** - mild
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.55 cm	99,277	2.68E-06	4,574.68	1.50
100 gm / 3.97 cm	9,928	2.68E-07	457.47	0.15
10 gm / 1.84 cm	993	2.68E-08	45.75	0.02
1 gm / 8.55 mm	99	2.68E-09	4.57	0.00
0.1 gm / 3.97 mm	10	2.68E-10	0.46	0.00
0.01 gm / 1.84 mm	1	2.68E-11	0.05	0.00
0.001 gm / 0.85 mm	0	2.68E-12	0.00	0.00

Weight of pure Ferrokentbrooksite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.06 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.22 % Th) From Sum REE Elements ( 4.41 % REE)

Ferrokentbrooksite Classification

Dana Class:

64.01.01.07 (64)Cyclosilicates

(64.01)Cyclosilicate Rings with Other Anions and Insular Silicate Groups with mixed ring types

(64.01.01)Eudialyte Group

64.01.01.01 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m

64.01.01.02 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl•2(H2O) R 3m 3 2/m

64.01.01.03 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2•2(H2O) R 3m 3m

64.01.01.04 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

64.01.01.05 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

64.01.01.06 Oneillite! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3

64.01.01.07 Ferrokentbrooksite! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m

64.01.01.08 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl•2-3H2O R 3m 3m

64.01.01.09 Feklichevite! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m

64.01.01.10 Rastsvetaevite! Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 R 3m 3m

64.01.01.11 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m

64.01.01.12 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)•H2O R 3m 3m

64.01.01.13 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)•H2O R 3m 3m

64.01.01.14 Labyrinthite! (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3 R 3m 3m

64.01.01.15 Aqualite! (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl R 3m 3m

64.01.01.16 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m

64.01.01.17 Georgbarsanovite! Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2•H2O R 3m 3m

64.01.01.18 Johnsenite-(Ce)! Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2 R 3m 3m

64.01.01.19 Golyshevite! (Na,Ca)10Ca9(Fe,Fe)2Zr3NbSi25O72(CO3)(OH)3•H2O R 3m 3m

64.01.01.20 Mogovidite! Na9(Ca,Na)6Ca6Fe2Zr3[]Si25O72(CO3)(OH)4 R 3m 3m

64.01.01.21 Dualite! Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3MnSi51O144(OH,H2O,Cl)9 R 3m 3m

64.01.01.22 Voronkovite! Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl•H2O R 3 3

Strunz Class:

09.CO.10 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CO -[Si9O27]18- 9-membered rings

09.CO.10 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl•2(H2O) R 3m 3 2/m

09.CO.10 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m

09.CO.10 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2•2(H2O) R 3m 3m

09.CO.10 Labyrinthite! (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3 R 3m 3m

09.CO.10 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)•H2O R 3m 3m

09.CO.10 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)•H2O R 3m 3m

09.CO.10 Mogovidite! Na9(Ca,Na)6Ca6Fe2Zr3[]Si25O72(CO3)(OH)4 R 3m 3m

09.CO.10 Voronkovite! Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl•H2O R 3 3

09.CO.10 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m

09.CO.10 Aqualite! (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl R 3m 3m

09.CO.10 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m

09.CO.10 Feklichevite! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m

09.CO.10 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl•2-3H2O R 3m 3m

09.CO.10 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

09.CO.10 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

09.CO.10 Oneillite! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3

09.CO.10 Ferrokentbrooksite! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m

09.CO.10 Rastsvetaevite! Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 R 3m 3m

09.CO.10 Johnsenite-(Ce)! Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2 R 3m 3m

09.CO.10 Georgbarsanovite! Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2•H2O R 3m 3m

09.CO.10 Golyshevite! (Na,Ca)10Ca9(Fe,Fe)2Zr3NbSi25O72(CO3)(OH)3•H2O R 3m 3m

09.CO.10 Dualite! Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3MnSi51O144(OH,H2O,Cl)9 R 3m 3m

Other Ferrokentbrooksite Information

References:

NAME( CanMin, Vol 41, p 55) PHYS. PROP.(CanMin, Vol 41, p 55) OPTIC PROP.(CanMin, Vol 41, p 55)

See Also:

Links to other databases for Ferrokentbrooksite :
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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Print or Cut-and-Paste your Ferrokentbrooksite Specimen Label here :

Ferrokentbrooksite

Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2
Dana No: 64.01.01.07 Strunz No: 09.CO.10
Locality:

Notes: