Zirsilite-(Ce) Mineral Data

Zirsilite-(Ce) Mineral Data

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General Zirsilite-(Ce) Information

Chemical Formula:

(Na,[ ])12(Ce, Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O

Composition:

Molecular Weight = 3,310.41 gm

Sodium 6.77 % Na 9.13 % Na₂O

Calcium 7.26 % Ca 10.16 % CaO

Cerium 9.52 % Ce 11.15 % Ce₂O₃

Zirconium 8.27 % Zr 11.17 % ZrO₂

Manganese 4.98 % Mn 6.43 % MnO

Niobium 2.81 % Nb 4.01 % Nb₂O₅

Silicon 21.21 % Si 45.38 % SiO₂

Hydrogen 0.15 % H 1.36 % H₂O

Carbon 0.36 % C 1.33 % CO₂

Oxygen 38.66 % O

______ ______

100.00 % 100.12 % = TOTAL OXIDE

Empirical Formula:

Na₉Ce_2.25Na_0.75Ca₆Mn²⁺₃Zr₃NbSi₂₅O₇₃(OH)₃(CO₃)·(H₂O)

Environment:

As zoned rhombohedral crystals up to 2 cm across, with a carbokentbrooksite core and a zirsilite-(Ce) rim. Eudialyte group; structure determined

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Dara-i-Pioz alkaline massif, Tajikistan. Link to MinDat.org Location Data.

Name Origin:

Reflects the chemical composition, ZIRconium, SILicon, Cerium).

Synonym:

IMA2002-057

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Zirsilite-(Ce) Crystallography

Axial Ratios:

a:c = 1:2.11089

Cell Dimensions:

a = 14.248, c = 30.076, Z = 3; V = 5,287.60 Den(Calc)= 3.12

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): 3.22(1)(028), 2.979(0.95)(135), 2.857(0.88)(044),3.166(0.56)(127), 4.32(0.51)(025), 3.975(0.37)(032), 3.536(0.33)(027),

Physical Properties of Zirsilite-(Ce)

Cleavage:

None

Color:

Cream.

Density:

3.15

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Epitaxial - Crystallographic alignment with a precursor mineral

Habit:

Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Zirsilite-(Ce)

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2059,KPDmeas= 0.204,KC= 0.2035

Optical Data:

Uniaxial (-), e=1.637, w=1.648, bire=0.0110.

Calculated Properties of Zirsilite-(Ce)

Electron Density:

r_electron=3.03 gm/cc
note: r_{Zirsilite-(Ce)}=3.15 gm/cc.

Fermion Index

Fermion Index = 0.0195
Boson Index = 0.9805

Photoelectric:

PE_{Zirsilite-(Ce)}= 63.93 barns/electron
U=PE_{Zirsilite-(Ce)} x r_electron= 194.03 barns/cc.

Radioactivity:

GRapi = 9,787.12 (Gamma Ray American Petroleum Institute Units)

Zirsilite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Zirsilite-(Ce)** - 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 / 8.46 cm	213,321	5.77E-06	9,787.12	3.22
100 gm / 3.93 cm	21,332	5.77E-07	978.71	0.32
10 gm / 1.82 cm	2,133	5.77E-08	97.87	0.03
1 gm / 8.46 mm	213	5.77E-09	9.79	0.00
0.1 gm / 3.93 mm	21	5.77E-10	0.98	0.00
0.01 gm / 1.82 mm	2	5.77E-11	0.10	0.00
0.001 gm / 0.85 mm	0	5.77E-12	0.01	0.00

Weight of pure Zirsilite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.15 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 ( 0.48 % Th) From Sum REE Elements ( 9.52 % REE)

Zirsilite-(Ce) Classification

Dana Class:

64.1.1.13 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups

(64.1)with mixed ring types

(64.1.1)Eudialyte Group

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

64.1.1.17 Georgbarsanovite! Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2·H2O R 3m 3m

64.1.1.18 IMA2004-026! Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(OH)3(CO3)·H2O R 3m 3m

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

Strunz Class:

VIII/E.25-56 VIII - Silicates

VIII/E - Cyklosilicates, triplet rings, nine-rings and ten-rings

VIII/E.25 - Eudialyte - Alluaivite series

VIII/E.25-10 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m

VIII/E.25-14 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl·2-3H2O R 3m 3m

VIII/E.25-16 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m

VIII/E.25-20 Ferrokentbrooksite! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m

VIII/E.25-30 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2·2(H2O) R 3m 3m

VIII/E.25-32 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m

VIII/E.25-40 Oneillite! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3

VIII/E.25-50 Feklichevite! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m

VIII/E.25-56 Zirsilite-(Ce) (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m

VIII/E.25-58 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m

VIII/E.25-60 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

VIII/E.25-70 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

VIII/E.25-80 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl·2(H2O) R 3m 3 2/m

Other Zirsilite-(Ce) Information

References:

NAME( CanMin, 42:1260) PHYS. PROP.(CanMin, 42:1260) OPTIC PROP.(CanMin, 42:1260)

See Also:

Links to other databases for Zirsilite-(Ce) :
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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Zirsilite-(Ce)

(Na,[ ])12(Ce, Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O
Dana No: 64.1.1.13 Strunz No: VIII/E.25-56
Locality:

Notes: