General Ferrokentbrooksite Information
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Chemical Formula: |
Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 |
Composition: |
Molecular Weight = 3,231.96 gm |
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Potassium 0.39 % K 0.47 % K2O |
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Sodium 9.28 % Na 12.51 % Na2O |
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Strontium 0.41 % Sr 0.48 % SrO |
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Calcium 5.98 % Ca 8.36 % CaO |
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La,Ce,Pr,Nd,Sm, 4.41 % RE 5.15 % REE2O3 |
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Yttrium 0.47 % Y 0.59 % Y2O3 |
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Hafnium 0.17 % Hf 0.20 % HfO2 |
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Zirconium 8.67 % Zr 11.70 % ZrO2 |
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Tantalum 0.11 % Ta 0.14 % Ta2O5 |
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Titanium 0.06 % Ti 0.10 % TiO2 |
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Manganese 3.14 % Mn 4.06 % MnO |
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Niobium 1.84 % Nb 2.63 % Nb2O5 |
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Aluminum 0.06 % Al 0.11 % Al2O3 |
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Iron 4.13 % Fe 5.31 % FeO |
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Silicon 21.86 % Si 46.77 % SiO2 |
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Hydrogen 0.04 % H 0.33 % H2O |
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Chlorine 0.98 % Cl 0.98 % Cl |
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- %
Cl -0.22 % -O=Cl2 |
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Oxygen 37.13 % O |
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Fluorine 0.89 % F 0.89 % F |
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- %
F -0.37 % -O=F2 |
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______ ______ |
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100.00 % 100.19 % = TOTAL OXIDE |
Empirical Formula: |
Na13.05REE0.99K0.32Ca0.23Sr0.15Ca4.59Mn2+1.24Y0.17Fe2+2.39Mn2+0.61Zr3Ti0.04Hf0.03
Nb0.64Si0.23Zr0.07Ta0.02Si24.93Al0.07(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 |
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Ferrokentbrooksite Image |
Images:
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Ferrokentbrooksite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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), |
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Physical Properties of Ferrokentbrooksite
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Cleavage: |
None |
Color: |
Reddish brown, Red. |
Density: |
3.06 |
Diaphaniety: |
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 |
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Optical Properties of Ferrokentbrooksite
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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 |
Optical Data: |
Uniaxial (-), e=1.6186, w=1.6221, bire=0.0035. |
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Calculated Properties of Ferrokentbrooksite
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Electron Density: |
relectron=2.96 gm/cc note: rFerrokentbrooksite =3.06 gm/cc. |
Fermion Index |
Fermion Index = 0.03016 Boson Index = 0.96984 |
Photoelectric: |
PEFerrokentbrooksite = 47.82 barns/electron U=PEFerrokentbrooksite x relectron= 141.60 barns/cc. |
Radioactivity: |
GRapi = 4,574.67 (Gamma Ray American Petroleum Institute Units)
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 Bequerols (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 |
4,574.67 |
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)
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Ferrokentbrooksite Classification
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Dana Class: |
64.1.1.7 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups |
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(64.1)with mixed ring types |
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(64.1.1)Eudialyte Group |
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64.1.1.1 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m |
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64.1.1.2 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl·2(H2O) R 3m 3 2/m |
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64.1.1.3 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2·2(H2O) R 3m 3m |
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64.1.1.4 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m |
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64.1.1.5 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m |
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64.1.1.6 Oneillite! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3 |
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64.1.1.7 Ferrokentbrooksite ! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m |
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64.1.1.8 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl·2-3H2O R 3m 3m |
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64.1.1.9 Feklichevite! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m |
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64.1.1.10 Rastsvetaevite! Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 R 3m 3m |
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64.1.1.11 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m |
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64.1.1.12 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m |
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64.1.1.13 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m |
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64.1.1.14 Labyrinthite! (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3 R 3m 3m |
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64.1.1.15 Aqualite! (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl R 3m 3m |
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64.1.1.16 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m |
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64.1.1.17 Georgbarsanovite! Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2·H2O R 3m 3m |
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64.1.1.18 IMA2004-026! Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(OH)3(CO3)·H2O R 3m 3m |
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64.1.1.19 Mogovidite! Na9(Ca,Na)6Ca6Fe2Zr3[]Si25O72(CO3)(OH)4 R 3m 3m |
Strunz Class: |
VIII/E.25-20 VIII - Silicates |
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VIII/E - Cyklosilicates, triplet rings, nine-rings and ten-rings |
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VIII/E.25 - Eudialyte - Alluaivite series |
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VIII/E.25-10 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m |
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VIII/E.25-14 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl·2-3H2O R 3m 3m |
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VIII/E.25-16 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m |
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VIII/E.25-20 Ferrokentbrooksite Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m |
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VIII/E.25-30 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2·2(H2O) R 3m 3m |
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VIII/E.25-32 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m |
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VIII/E.25-40 Oneillite! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3 |
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VIII/E.25-50 Feklichevite! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m |
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VIII/E.25-56 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m |
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VIII/E.25-58 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m |
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VIII/E.25-60 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m |
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VIII/E.25-70 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m |
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VIII/E.25-80 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl·2(H2O) R 3m 3 2/m |
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Other Ferrokentbrooksite Information
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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 -Google Images
4 -Google Scholar
5 -MinDAT
6 -MinMax(Deutsch)
7 -MinMax(English)
8 -Mineralienatlas (Deutsch)
9 -QUT Mineral Atlas
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Print or Cut-and-Paste your Ferrokentbrooksite Specimen Label here :
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Ferrokentbrooksite
Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2
Dana No: 64.1.1.7 Strunz No: VIII/E.25-20
Locality:
Notes:
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