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Paulscherrerite

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Formula:
UO
 
2
(OH)
 
2
System:Monoclinic
Member of:Schoepite Group
Name:
For Paul Scherrer (1890-1969), Swiss physicist, professor of experimental physics in the Eidgenössische Technische Hochschule of Zürich, Switzerland, and president of the Swiss Atomic Energy Commission. In 1918, together with Paul Debye, he developed a technique for crystal structure determination by X-ray diffraction on powders (Debye-Scherrer technique). He is also known for the Scherrer equation, which describes the dependence of line broadening of reflected X-rays on crystal size for small particles.


Occurs as a dehydration product of metaschoepite.
Previously, generally called 'dehydrated schoepite.'

Classification of Paulscherrerite

IMA status:Approved 2008
Nickel-Strunz 10th (pending) edition ID:4.GA.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
A : Without additional cations
Dana 8th edition ID:5.2.2.

5 : OXIDES CONTAINING URANIUM OR THORIUM
2 : AXO3·xH2O
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Type Occurrence of Paulscherrerite

Type Locality:Radium Ridge, Mt Painter area, North Flinders Ranges, Flinders Ranges, South Australia, Australia

Crystallography of Paulscherrerite

Crystal System:Monoclinic
Cell Parameters:a = 4.281Å, b = 10.230Å, c = 6.865Å
β = 90.35°
Ratio:a:b:c = 0.418 : 1 : 0.671
Unit Cell Volume:V 300.64 ų (Calculated from Unit Cell)
Comment:pseudo-orthorhombic
X-Ray Powder Diffraction:
d-spacingIntensity
5.085 (64)
3.424 (100)
3.405 (27)
2.848 (18)
2.483 (23)
1.9854 (13)
1.9737 (23)
1.7820 (9)

Chemical Properties of Paulscherrerite

Formula:
UO
 
2
(OH)
 
2
Essential elements:H, O, U
All elements listed in formula:H, O, U

Relationship of Paulscherrerite to other Species

Member of:Schoepite Group
Other Members of Group:

- +
Metaschoepite
UO
 
3
 · 1-2H
 
2
O
Schoepite
(UO
 
2
)
 
8
O
 
2
(OH)
 
12
 · 12H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
4.GA.05Metaschoepite
UO
 
3
 · 1-2H
 
2
O
4.GA.05Paraschoepite
UO
 
3
 · 2H
 
2
O
4.GA.05Schoepite
(UO
 
2
)
 
8
O
 
2
(OH)
 
12
 · 12H
 
2
O
4.GA.10Ianthinite
U
4+
 
(UO
 
2
)
 
5
O
 
7
 · 10H
 
2
O
4.GA.15Metastudtite
UO
 
4
 · 2H
 
2
O
4.GA.15Studtite
[(UO
 
2
)(O
 
2
)(H
 
2
O)
 
2
] · H
 
2
O

Other Names for Paulscherrerite

Synonyms:
Dehydrated schoepiteIMA2008-022
Other Languages:

Other Information

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 Paulscherrerite

Reference List:

- +
Finch, R. J., Hawthorne, F. C., Miller, M. L. & Ewing, R. C. (1997): Distinguishing among schoepite, [(UO2)8O2(OH)12](H2O)12, and related minerals by X-ray powder diffraction. Powder Diffraction 12, 230-238.

Finch, R.J., Hawthorne, F.C. and Ewing, R.C. (1998): Structural relations among schoepite, metaschoepite and "dehydrated schoepite". Canadian Mineralogist 36, 831-845.

Sowder, A. G.; Clark, S. B.; Fjeld, R. A. (1999): The transformation of uranyl oxide hydrates: The effect of dehydration on synthetic metaschoepite and its alteration to becquerelite. Environ. Sci. Technol. 33, 3552-3557. [as dehydrated schoepite]

Brugger, J., Meisser, N., Etschmann, B., Ansermet, S., Pring, A. (2011): Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia: "dehydrated schoepite" is a mineral after all. American Mineralogist 96, 229-240.

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    • Localities for Paulscherrerite

    Hide Locality List
    (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.
    Australia
     
    • South Australia
      • Flinders Ranges
        • North Flinders Ranges
          • Mt Painter area
    		IMA website - Proposals approved in August 2008
    USA
     
    • New Hampshire
      • Grafton Co.
        • Grafton
    		Brugger, J., Meisser, N., Etschmann, B., Ansermet, S., Pring, A. (2011): Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia: “dehydrated schoepite” is a mineral after all. American Mineralogist, 96
        • Groton
    		Brugger, J., Meisser, N., Etschmann, B., Ansermet, S., Pring, A. (2011): Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia: “dehydrated schoepite” is a mineral after all. American Mineralogist, 96
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