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Johnsenite-(Ce)

Formula:
Na
 
12
(Ce,La,Sr,Ca)
 
3
Ca
 
6
Mn
 
3
Zr
 
3
W[(OH,Cl)
 
2
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · H
 
2
O
System:TrigonalColour:Pale yellow to bright ...
Hardness:5 - 6
Name:Named after Ole Johnsen of the Geological Museum, University of Copenhagen, Denmark


Eudialyte Group

W analogue of Zirsilite-(Ce),

Classification of Johnsenite-(Ce)

IMA status:Approved 2004
Strunz 8th edition ID:8/E.25-57
Nickel-Strunz 10th (pending) edition ID:9.CO.10

9 : SILICATES (Germanates)
C : Cyclosilicates
O : [Si9O27]18- 9-membered rings
Dana 8th edition ID:64.1.2.7

64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
1 : Rings with Other Anions and Insular Silicate Groups with mixed ring types
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Type Occurrence of Johnsenite-(Ce)

Type Locality:Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
General Appearance of Type Material:deeply etched, skeletal crystals to 4 mm and aggregates to 1 cm
Associated Minerals at type locality:
Zirsilite-(Ce)ZakharoviteTuperssuatsiaiteTitaniteStillwellite-(Ce)
SteacyiteSphaleriteRhodochrositeQuartzPyrrhotite
PyritePectoliteNatroliteMolybdeniteMicrocline
GalenaEpididymiteDawsoniteCerite-(Ce)Catapleiite
CalciteApophyllite-(KF)Amphibole GroupAlbiteAegirine

Physical Properties of Johnsenite-(Ce)

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Pale yellow to bright orange
Streak:White
Hardness (Mohs):5 - 6
Tenacity:Brittle
Cleavage:None Observed
Parting:None observed
Fracture:Irregular/Uneven
Density (measured):3.24 g/cm3
Density (calculated):3.23 g/cm3

Crystallography of Johnsenite-(Ce)

Crystal System:Trigonal
Class (H-M):3m - Ditrigonal Pyramidal
Space Group:R3m
Cell Parameters:a = 14.237Å, c = 30.03Å
Ratio:a:c = 1 : 2.109
Unit Cell Volume:V 5271 ų
Z:3
Morphology:Deeply etched, skeletal crystals to 4 mm and aggregates of crystals to 1 cm.
Twinning:No indications observed.
X-Ray Powder Diffraction:
d-spacingIntensity
11.308 (95)
9.460 (81)
4.295 (34)
3.547 (36)
3.395 (38)
3.167 (75)
2.968 (100)
Comments:Format: d/Å (I/%) (hkl),
from type description

Optical Data of Johnsenite-(Ce)

Type:Uniaxial (-)
Pleochroism:Non-pleochroic

Chemical Properties of Johnsenite-(Ce)

Formula:
Na
 
12
(Ce,La,Sr,Ca)
 
3
Ca
 
6
Mn
 
3
Zr
 
3
W[(OH,Cl)
 
2
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · H
 
2
O
All elements listed in formula:C, Ca, Ce, Cl, H, La, Mn, Na, O, Si, Sr, W, Zr
Analytical Data:Mean values out of eight electron microprobe analyses, three of which were carried out on the grain used for the structure determination.
The CO2 and H2O contents were calculated by stoichiometry based on the results from crystal-structure analysis. The empirical formula is based on 29 Si, Zr, Ti, Hf, Nb and W atoms and cations, respectively, and one carbonate anion (as determined in the crystal-structure analysis).
Na2O (10.47)
K2O (0.25)
CaO (8.98)
SrO (1.60)
MnO (5.43)
FeO (1.61)
Y2O3 (0.70)
La2O3 (1.56)
Ce2O3 (3.01)
Pr2O3 (1.14)
Nd2O3 (0.89)
Sm2O3 (0.12)
Gd2O3 (0.33)
Dy2O3 (0.14)
TiO2 (0.73)
ZrO2 (9.60)
HfO2 (0.04)
Nb2O5 (0.82)
WO3 (5.23)
SiO2 (43.16)
Cl (0.77)
CO2 (1.27)
H2O (0.32)

O = Cl –0.17

total 97.99 wt. %
Empirical Formula:
Na
 
11.74
(REE
 
1.00
Sr
 
0.54
Ca
 
0.51
Y
 
0.22
K
 
0.19
)
 
2.46
(Ca
 
5.06
REE
 
0.50
Mn
 
0.44
)
 
6
(Mn
 
2.22
Fe
 
0.78
)
 
3
(Zr
 
2.71
Ti
 
0.32
Hf
 
0.01
)
 
3.04
(W
 
0.78
Nb
 
0.21
)
 
0.99
Si
 
24.97
O
 
73
(CO
 
3
)(OH,Cl
 
0.75
)
 
1.75

Relationship of Johnsenite-(Ce) to other Species

Member of Group:
Eudialyte Group:
Related Minerals - Nickel-Strunz Grouping):

- +
9.CO.10Alluaivite
Na
 
19
(Ca,Mn)
 
6
(Ti,Nb)
 
3
Si
 
26
O
 
74
Cl·2H
 
2
O
9.CO.10Eudialyte
Na
 
15
Ca
 
6
(Fe
2+
 
,Mn
2+
 
)
 
3
Zr
 
3
[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
9.CO.10Ferrokentbrooksite
Na
 
15
Ca
 
6
(Fe,Mn)
 
3
Zr
 
3
NbSi
 
25
O
 
73
(O,OH,H
 
2
O)
 
3
Cl
 
2
9.CO.10Kentbrooksite
(Na,REE)
 
15
(Ca,REE)
 
6
(Mn
2+
 
,Fe
2+
 
)
 
3
Zr
 
3
Nb[Si
 
25
O
 
74
]F
 
2
·2H
 
2
O
9.CO.10Khomyakovite
Na
 
12
Sr
 
3
Ca
 
6
Fe
 
3
Zr
 
3
W[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
9.CO.10Manganokhomyakovite
Na
 
12
Sr
 
3
Ca
 
6
Mn
 
3
Zr
 
3
W[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
9.CO.10Oneillite
Na
 
15
Ca
 
3
Mn
 
3
Fe
2+
3
Zr
 
3
Nb(Si
 
25
O
 
73
)(O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
9.CO.10Raslakite
Na
 
15
Ca
 
3
Fe
2+
3
(Na,Zr)
 
3
Zr
 
3
Nb
 
<0.5
[(Cl,OH)|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · 3(OH,H
 
2
O)
9.CO.10Feklichevite
Na
 
11
Ca
 
9
(Fe
3+
 
,Fe
2+
 
)
 
2
Zr
 
3
Nb[Si
 
25
O
 
73
](OH,H
 
2
O,Cl,O)
 
5
9.CO.10Carbokentbrooksite
Na
 
11-12
(Na,Ce)
 
3
Ca
 
6
Mn
 
3
Zr
 
3
Nb[(OH)
 
3
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · H
 
2
O
9.CO.10Zirsilite-(Ce)
Na
 
11-12
(Ce,Na)
 
3
Ca
 
6
Mn
 
3
Zr
 
3
Nb[(OH)
 
3
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · H
 
2
O
9.CO.10Ikranite
(Na,H
 
3
O)
 
15
(Ca,Mn
2+
 
)
 
6
Fe
3+
2
Zr
 
3-4
[Cl|(H
 
0-3
Si
 
3
O
 
9
)
 
2
|{(Si
 
9
O
 
27
)
 
2
,(Si
 
9
O
 
27
)
 
2
SiO}] · 2-3H
 
2
O
9.CO.10Taseqite
Na
 
12
Sr
 
3
Ca
 
6
Fe
 
3
Zr
 
3
Nb[Cl
 
2
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · 3(O,OH,H
 
2
O)
9.CO.10Rastsvetaevite
Na
 
27
K
 
8
Ca
 
12
Fe
 
3
Zr
 
6
Si
 
52
O
 
144
(O,OH,H
 
2
O)
 
6
Cl
 
2
9.CO.10Golyshevite
[Na
 
10
Ca
 
3
]Ca
 
6
Zr
 
3
Fe
 
2
SiNb[(OH)
 
3
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
] · H
 
2
O
9.CO.10Labyrinthite
(Na,K,Sr)
 
35
Ca
 
12
Fe
 
3
Zr
 
6
TiSi
 
51
O
 
144
(O,OH,H
 
2
O)
 
9
Cl
 
3
9.CO.10Mogovidite
Na
 
9
(Ca,Na)
 
5
Ca
 
6
Zr
 
3
Fe
 
2
(Si,Nb)[(OH,H
 
2
O)
 
3
|Cl
 
0.3
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
(Si
 
9
O
 
27
)
 
2
]
9.CO.10Georgbarsanovite
Na
 
12
(Mn,Sr,REE)
 
3
Ca
 
6
Fe
2+
3
Zr
 
3
NbSi
 
25
O
 
76
Cl
 
2
·H
 
2
O
9.CO.10Aqualite
(H
 
3
O)
 
8
(Na,K,Sr)
 
5
Ca
 
6
Zr
 
3
Si
 
26
O
 
66
(OH)
 
9
Cl
9.CO.10Dualite
Na
 
30
(Ca,Na,Ce,Sr)
 
12
(Na,Mn,Fe,Ti)
 
6
Zr
 
3
Ti
 
3
Mn[Si
 
51
O
 
144
](OH,H
 
2
O,Cl)
 
9
9.CO.10Andrianovite
Na
 
12
(K,Sr,Ce)
 
3
Ca
 
6
Mn
 
3
Zr
 
3
Nb(Si
 
25
O
 
73
)(O,H
 
2
O,OH)
 
5
9.CO.10Voronkovite
Na
 
15
(Na,Ca,Ce)
 
3
(Mn,Ca)
 
3
Fe
 
3
Zr
 
3
Si
 
26
O
 
72
(OH,O)
 
4
Cl·H
 
2
O
9.CO.10UM1999-36-SiO:CaCeHMnNaNbSrZr
Na
 
17
(Ca,Ce,Sr)
 
2
Mn
 
3
(Zr,Nb)
 
4
Si
 
25
O
 
73
(O,OH,F,Cl)
 
5
9.CO.10UM2000-66-SiO:CaClFeHMnNaNbSrZr
Na
 
12
(Ca,Mn)
 
6
(Sr,Na,K)
 
3
(Fe,Mn)
 
3
(Zr,Nb)
 
4
Si
 
25
O
 
66
(OH,Cl)
 
11
9.CO.10IMA2009-039
Na
 
14
Ca
 
6
Mn
 
3
Zr
 
3
[Si
 
26
O
 
72
(OH)
 
2
](H
 
2
O,Cl,O,OH)
 
6

Other Names for Johnsenite-(Ce)

Synonyms:
IMA2004-026
Other Languages:
German:Johnsenit-(Ce)

Other Information

Fluorescence in UV light:None (SW & LW UV).
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Johnsenite-(Ce)

Reference List:Grice, J.D. & Gault, R.A. (2006): Johnsenite-(Ce), a new member of the eudialyte group from Mont Saint-Hilaire, Quebec, Canada. Canadian Mineralogist 44: 105-115.

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    Localities for Johnsenite-(Ce)

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Québec
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		Grice, J.D. & Gault, R.A. (2006): Johnsenite-(Ce), a new member of the eudialyte group from Mont Saint-Hilaire, Quebec, Canada. Canadian Mineralogist 44:105-115
    Mineral and/or Locality
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