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A member of the Crichtonite Group.
Cleusonite is partly metamict. The radiation damage results in macroscopic swelling (i. e. variable density and unit cell dimensions) and also makes the mineral appear optically isotropic. The calculated density and the crystallographical data given here are those of a crystal treated at 1000 °C (Wülser et al., 2005).
A large number of U-bearing "senaites" from Alpine localities later turned out to be cleusonite instead.
Classification of Cleusonite
|IMA status:||Approved 1998|
|Strunz 8th edition ID:||4/C.09-90|
|Nickel-Strunz 10th (pending) edition ID:||4.CC.40|
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
C : With large and medium-sized cations
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Type Occurrence of Cleusonite
|Type Locality:||Cleuson lake, Nendaz Valley, Wallis (Valais), Switzerland|
|General Appearance of Type Material:||cm-sized tabular crystals|
|Geological Setting of type material:||greenschist facies metamorphosed gneissic series of the Mont Fort and Siviez-Mischabel Nappes|
Physical Properties of Cleusonite
|Density (measured):||4.74 - 4.93 g/cm3|
|Density (calculated):||5.27 g/cm3|
Crystallography of Cleusonite
|Class (H-M):||3 - Pyramidal|
|Cell Parameters:||a = 10.385(2) Å, c = 20.900(7) Å|
|Ratio:||a:c = 1 : 2.013|
|Unit Cell Volume:||V 1,952.05 Å³ (Calculated from Unit Cell)|
|Morphology:||Multiple rhombohedra and hexagonal prisms.|
|Comment:||Cells: a = 10.576(3), c = 21.325(5) Å (untreated crystal) to a = 10.4188(6), c = 20.942(1) Å (800°C treatment) and to a = 10.385(2), c = 20.900(7) Å (1000°C treatment).|
Optical Data of Cleusonite
|Colour in reflected light:||light grey to white|
Chemical Properties of Cleusonite
|Simplified for copy/paste:||(Pb,Sr)(U4+,U6+)(Fe2+,Zn)2(Ti,Fe2+,Fe3+)18(O,OH)38|
|Essential elements:||Fe, O, Pb, Ti, U|
|All elements listed in formula:||Fe, H, O, Pb, Sr, Ti, U, Zn|
Relationship of Cleusonite to other Species
|Member of:||Crichtonite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
Other Names for Cleusonite
|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 Cleusonite
Wülser, P.-A., Meisser, N., Brugger, J., Schenk, K., Ansermet, S., Bonin, M., Bussy, F. (2005): Cleusonite, (Pb,Sr)(U4+,U6+)(Fe2+,Zn)2(Ti,Fe2+,Fe3+)18(O,OH)38, a new mineral species of the crichtonite group from the western Swiss Alps. European Journal of Mineralogy, 17, 933-942
Internet Links for Cleusonite
Localities for Cleusonite
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.
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