Johnsenite-(Ce) Mineral Data

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General Johnsenite-(Ce) Information

Chemical Formula:

Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2

Composition:

Molecular Weight = 3,374.09 gm

Potassium 0.22 % K 0.27 % K₂O

Sodium 8.00 % Na 10.78 % Na₂O

Strontium 1.40 % Sr 1.66 % SrO

Calcium 6.62 % Ca 9.26 % CaO

Lanthanum 1.36 % La 1.59 % La₂O₃

Cerium 2.66 % Ce 3.11 % Ce₂O₃

Praeseodymium 1.00 % Pr 1.17 % Pr₂O₃

Samarium 0.09 % Sm 0.10 % Sm₂O₃

Gadolinium 0.28 % Gd 0.32 % Gd₂O₃

Dysprosium 0.14 % Dy 0.17 % Dy₂O₃

Yttrium 0.58 % Y 0.74 % Y₂O₃

Hafnium 0.05 % Hf 0.06 % HfO₂

Zirconium 7.33 % Zr 9.90 % ZrO₂

Titanium 0.45 % Ti 0.76 % TiO₂

Manganese 4.33 % Mn 5.59 % MnO

Niobium 0.58 % Nb 0.83 % Nb₂O₅

Iron 1.29 % Fe 1.66 % FeO

Silicon 20.78 % Si 44.47 % SiO₂

Hydrogen 0.04 % H 0.33 % H₂O

Tungsten 4.25 % W 5.36 % WO₃

Carbon 0.36 % C 1.30 % CO₂

Neodymium 0.77 % Nd 0.90 % Nd₂O₃

Chlorine 0.79 % Cl 0.79 % Cl

- % Cl -0.18 % -O=Cl₂

Oxygen 36.63 % O

______ ______

100.00 % 100.94 % = TOTAL OXIDE

Empirical Formula:

Na_11.74Ce_0.64La_0.33Dy_0.03Sr_0.54Ca_0.51Y_0.22K_0.19Ca_5.06Pr_0.24Nd_0.18Gd_0.06Sm_0.02Mn²⁺_0.44 Mn²⁺_2.22Fe²⁺_0.78Zr_2.71Ti_0.32Hf_0.01Cl_0.75

Environment:

Occurs intergrown with zirsilite-(Ce) in a cavity near the margin of a marble xenolith in an igneous breccia along the contact between porphyritic nepheline syenite and sodalite sye nite. Eudialyte group

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

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

Name Origin:

Named for Ole Johnsen (b. 1940), of the Geological Museum, University of Copenhagen, Denmark, and for his extensive research into the eudialyte group.

Synonym:

IMA2004-026

Johnsenite-(Ce) Image

Images:

Click Here for Larger Johnsenite-(Ce) Image

Johnsenite-(Ce) Macfallite Braunite-I

Comments: Tiny - less than 1mm - maroon crystals of mcfallite suspended as inclusions in massive quartz along with larger spots of brown johnsenite-(Ce) and braunite.
Location: Artur mine, Jaguaracu, Minas Gerais, Brazil. Scale: Overall 3 x 2.5 slab.
© Tom Loomis / Dakota Matrix

Johnsenite-(Ce) Crystallography

Axial Ratios:

a:c = 1:2.10929

Cell Dimensions:

a = 14.237, c = 30.03, Z = 3; V = 5,271.37 Den(Calc)= 3.19

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): 2.966(1)(315), 11.299(0.95)(101), 2.847(0.81)(404),9.452(0.81)(012), 3.164(0.75)(217), 3.544(0.44)(220), 3.392(0.38)(131), 4.291(0.34)(205), 1.7799(0.31)(440),

Physical Properties of Johnsenite-(Ce)

Cleavage:

None

Color:

Pale yellow, Bright orange.

Density:

3.2

Diaphaneity:

Translucent to transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Skeletal - Crystals form crude outlines with missing faces.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Johnsenite-(Ce)

Gladstone-Dale:

CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2014,KPDmeas= 0.2008,KC= 0.2029
Ncalc = 1.65

Optical Data:

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

Calculated Properties of Johnsenite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.06 gm/cc
note: Specific Gravity of Johnsenite-(Ce) =3.19 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Johnsenite-(Ce)}= 96.52 barns/electron
U=PE_{Johnsenite-(Ce)} x r_electron= 295.32 barns/cc.

Radioactivity:

GRapi = 6,454.67 (Gamma Ray American Petroleum Institute Units)
Concentration of Johnsenite-(Ce) per GRapi unit = 154.93 (PPM)

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

**Estimated Radioactivity from Johnsenite-(Ce)** - 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 / 8.43 cm	141,328	3.82E-06	6,454.67	2.12
100 gm / 3.91 cm	14,133	3.82E-07	645.47	0.21
10 gm / 1.82 cm	1,413	3.82E-08	64.55	0.02
1 gm / 8.43 mm	141	3.82E-09	6.45	0.00
0.1 gm / 3.91 mm	14	3.82E-10	0.65	0.00
0.01 gm / 1.82 mm	1	3.82E-11	0.06	0.00
0.001 gm / 0.84 mm	0	3.82E-12	0.01	0.00

Weight of pure Johnsenite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.19 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 ( 0.32 % Th) From Sum REE Elements ( 6.30 % REE)

Johnsenite-(Ce) Classification

Dana Class:

64.01.01.18 (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 Johnsenite-(Ce) Information

References:

NAME( AmMin, v91, p1947) PHYS. PROP.(AmMin, v91, p1947) OPTIC PROP.(AmMin, v91, p1947)

See Also:

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

Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2
Dana No: 64.01.01.18 Strunz No: 09.CO.10
Locality:

Notes: