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Shumwayite

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About ShumwayiteHide

Formula:
(UO2)2(SO4)2·5H2O
Structural formula: [(UO2)(SO4)(H2O)2]2·5H2O
Colour:
Pale greenish-yellow
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
3.844 (Calculated)
Crystal System:
Monoclinic
Name:
For the Shumway family, whose members are connected with the discovery and exploitation of many uranium deposits of the Colorado Plateau, including that within the Green Lizard mine. Family members account for the discovery and mining of hundreds of uranium deposits on the Colorado Plateau. Arah E. Shumway (1891-1968) prospected Red Canyon during the 1920’s and was one of the first to stake mining claims and mine for uranium. Dan Shumway (b. 1946) was one of the claim stakers for the Green Lizard mine at which shumwayite was first recognized. Dr. Gary L. Shumway (b. 1938), Professor Emeritus of history at the University of California, Fullerton, is well-known for his research and publications on uranium mining and exploration.
New structure type.

The most simple uranyl sulfate mineral to date. Chemically similar (although basic) minerals are jáchymovite, uranopilite, metauranopilite.

Crystal structure details: (1) UO7 pentagonal bipyramids (2) SO4 tetrahedra; (3) U- and S-centred polyhedra share corners to form [(UO2)(SO4)(H2O)2] chains along [100]; (4) hydrogen bonds stand for an exclusive link for isolated intra-chain water molecules and the chains.


Classification of ShumwayiteHide

Approved
Approval Year:
2015
First Published:
2017

Physical Properties of ShumwayiteHide

Vitreous
Transparency:
Transparent
Colour:
Pale greenish-yellow
Streak:
White
Hardness:
Comment:
ca. 2
Tenacity:
Brittle
Cleavage:
Perfect
{011}
Fracture:
Irregular/Uneven
Density:
3.844 g/cm3 (Calculated)

Optical Data of ShumwayiteHide

Type:
Biaxial (+/-)
RI values:
nα = 1.581(1) nβ = 1.588(1) nγ = 1.595(1)
2V:
Measured: 89.8° (8), Calculated: 89.6°
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong (sense couldn't be defined due to ambiguous sign)
Pleochroism:
Non-pleochroic
Comments:
Orientation: X=b, Y≈c, Z≈a

Chemical Properties of ShumwayiteHide

Formula:
(UO2)2(SO4)2·5H2O

Structural formula: [(UO2)(SO4)(H2O)2]2·5H2O
IMA Formula:
[(UO2)(SO4)(H2O)2]2 · H2O

Crystallography of ShumwayiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 6.7475(1) Å, b = 12.5026(3) Å, c = 16.903(1) Å
β = 90.919(6)°
Ratio:
a:b:c = 0.54 : 1 : 1.352
Unit Cell V:
1425.79 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.97(39)
5.58(48)
5.11(100)
4.86(44)
4.40(38)
4.04(47)
3.459(42)
3.373(50)

Type Occurrence of ShumwayiteHide

General Appearance of Type Material:
prisms, up to about 0.3 mm, [100] elongation; often in subparallel to random intergrowths
Place of Conservation of Type Material:
Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 65589 and 65590 (GLM), 65591 and 65592 (GSM), and the Fersman Minera
Geological Setting of Type Material:
secondary (alteration) mineral
Associated Minerals at Type Locality:

Synonyms of ShumwayiteHide

Common AssociatesHide

CalciteCaCO3
GypsumCaSO4 · 2H2O
PlášiliteNa(UO2)(SO4)(OH)·2H2O
PyriteFeS2
RozeniteFeSO4 · 4H2O
SulphurS8

Fluorescence of ShumwayiteHide

bright greenish white (LW & SW)

Other InformationHide

Notes:
slightly deliquescent; easily soluble in RT water
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ShumwayiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka, J. and Lapčák, L. (2015) Shumwayite, IMA 2015-058. CNMNC Newsletter No. 27, October 2015, page 1228; Mineralogical Magazine: 79: 1229–1236.
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka, J., Lapčák, L. (2017) Shumwayite, [(UO2)(SO4)(H2O)2]2·H2O, a new uranyl sulfate mineral from Red Canyon, San Juan County, Utah, USA. Mineralogical Magazine: 881: 273–285.

Internet Links for ShumwayiteHide

Localities for ShumwayiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA
 
  • Utah
    • San Juan Co.
      • White Canyon District
        • Red Canyon
Travis Olds collection
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka, J. and Lapčák, L. (2015) Shumwayite, IMA 2015-058. CNMNC Newsletter No. 27, October 2015, page 1228; Mineralogical Magazine, 79, 1229–1236.
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka, J. and Lapčák, L. (2015) Shumwayite, IMA 2015-058. CNMNC Newsletter No. 27, October 2015, page 1228; Mineralogical Magazine, 79, 1229–1236.;Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka, J., Lapčák, L. (2017): Shumwayite, [(UO2)(SO4)(H2O)2]2·H2O, a new uranyl sulfate mineral from Red Canyon, San Juan County, Utah, USA. Mineralogical Magazine, 81, 273–285.
Mineral and/or Locality  
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