Classification of Johnsenite-(Ce) |
| IMA status: | Approved 2004 |
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| Strunz 8th edition ID: | 8/E.25-57
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| Nickel-Strunz 10th (pending) edition ID: | 9.CO.10
9 : SILICATES (Germanates) C : Cyclosilicates O : [Si9O27]18- 9-membered rings |
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| 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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| mindat.org URL: | http://www.mindat.org/min-27479.html Please feel free to link to this page. |
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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 |
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| General Appearance of Type Material: | deeply etched, skeletal crystals to 4 mm and aggregates to 1 cm |
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| Associated Minerals at type locality: | |
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Physical Properties of Johnsenite-(Ce) |
| Lustre: | Vitreous |
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| Diaphaneity (Transparency): | Transparent, Translucent |
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| Colour: | Pale yellow to bright orange |
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| Streak: | White |
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| Hardness (Mohs): | 5 - 6 |
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| Tenacity: | Brittle |
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| Cleavage: | None Observed |
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| Parting: | None observed |
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| Fracture: | Irregular/Uneven |
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| Density (measured): | 3.24 g/cm3 |
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| Density (calculated): | 3.23 g/cm3 |
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Crystallography of Johnsenite-(Ce) |
| Crystal System: | Trigonal |
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| Class (H-M): | 3m - Ditrigonal Pyramidal |
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| Space Group: | R3m |
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| Cell Parameters: | a = 14.237Å, c = 30.03Å
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| Ratio: | a:c = 1 : 2.109 |
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| Unit Cell Volume: | V 5271 ų |
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| Z: | 3 |
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| Morphology: | Deeply etched, skeletal crystals to 4 mm and aggregates of crystals to 1 cm. |
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| Twinning: | No indications observed. |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 11.308 | | (95) | | 9.460 | | (81) | | 4.295 | | (34) | | 3.547 | | (36) | | 3.395 | | (38) | | 3.167 | | (75) | | 2.968 | | (100) |
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| Comments: | Format: d/Å (I/%) (hkl),
from type description |
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Optical Data of Johnsenite-(Ce) |
| Type: | Uniaxial (-) |
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| Pleochroism: | Non-pleochroic |
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Chemical Properties of Johnsenite-(Ce) |
| Formula: | | Na | | (Ce,La,Sr,Ca) | | Ca | | Mn | | Zr | | W[(OH,Cl) | | |CO | | |(Si | | O | | ) | | |(Si | | O | | ) | | SiO] · H | | O |
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| All elements listed in formula: | C, Ca, Ce, Cl, H, La, Mn, Na, O, Si, Sr, W, Zr |
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| 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. % |
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| Empirical Formula: | | Na | | (REE | | Sr | | Ca | | Y | | K | | ) | | (Ca | | REE | | Mn | | ) | | (Mn | | Fe | | ) | | (Zr | | Ti | | Hf | | ) | | (W | | Nb | | ) | | Si | | O | | (CO | | )(OH,Cl | | ) | | |
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Relationship of Johnsenite-(Ce) to other Species |
| Member of Group: | |
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Related Minerals - Nickel-Strunz Grouping):
- + | |
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Other Names for Johnsenite-(Ce) |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Fluorescence in UV light: | None (SW & LW UV). |
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| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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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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Internet Links for Johnsenite-(Ce) |
| Search Engines: |
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| External Links: | Look for Johnsenite-(Ce) on WebmineralLook for Johnsenite-(Ce) on Athena MineralogyLook for Johnsenite-(Ce) on WikipediaLook for Johnsenite-(Ce) on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Johnsenite-(Ce) in the Natural History Museum (London) online catalogue |
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Localities for Johnsenite-(Ce) |
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
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