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Plášilite

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About PlášiliteHide

Jakub Plášil
Formula:
Na(UO2)(SO4)(OH)·2H2O
Colour:
Greenish yellow
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
3.726 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honour of Jakub Plášil (born 1984), crystallographer at the Department of Structure Analysis, Institute of Physics, Academy of Sciences of the Czech Republic, for his significant work on the crystal chemistry of hydrated oxysalts and hexavalent uranium minerals and compounds.
This page provides mineralogical data about Plášilite.


Classification of PlášiliteHide

Approved
Approval Year:
2014

Physical Properties of PlášiliteHide

Vitreous
Transparency:
Transparent
Colour:
Greenish yellow
Streak:
White
Hardness:
2 - 3 on Mohs scale
Comment:
Probably between 2 and 3
Tenacity:
Brittle
Cleavage:
Perfect
Two perfect cleavages, {010} and {001}.
Density:
3.726 g/cm3 (Calculated)

Optical Data of PlášiliteHide

Type:
Biaxial (+)
RI values:
nα = 1.556(1) nβ = 1.581(1) nγ = 1.608(1)
2V:
Measured: 88° , Calculated: 89°
Max Birefringence:
δ = 0.052
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Dispersion is moderate, r < v.
Pleochroism:
Visible
Comments:
X = nearly colourless, Y = very pale yellow, Z = pale yellow; X < Y < Z.

Chemical Properties of PlášiliteHide

Formula:
Na(UO2)(SO4)(OH)·2H2O
IMA Formula:
Na(UO2)(SO4)(OH) · 2H2O

Crystallography of PlášiliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 8.7122(6) Å, b = 13.8368(4) Å, c = 7.0465(2) Å
β = 112.126(8)°
Ratio:
a:b:c = 0.63 : 1 : 0.509
Unit Cell V:
786.89 ų
Z:
4
Morphology:
As long, thin blades, elongated on [001] and flattened on {100}; rarely as prisms, also elongated on [001]. Forms observed : {100}, {010} and {011}.
Twinning:
Commonly twinned on {100}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.90(100)
5.85(99)
4.024(57)
3.492(82)
3.136(40)
2.690(25)
2.618(34)
1.9212(30)

Type Occurrence of PlášiliteHide

General Appearance of Type Material:
In and on sandstone. A low-temperature, secondary mineral formed by the post-mining weathering of uraninite.
Place of Conservation of Type Material:
In the collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 64126, 64127, 64128, 64129 and 64130, and the Fersman Mineralogical Museum of the Russian
Academy of Sciences,
Geological Setting of Type Material:
Sandstone
Associated Minerals at Type Locality:

Synonyms of PlášiliteHide

Fluorescence of PlášiliteHide

Fluoresces bluish white under both long-wave and short-wave UV

Other InformationHide

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 PlášiliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Kasatkin, A.V., Čejka, J. and Marty, J. (2014) Plášilite, IMA 2014-021. CNMNC Newsletter No. 21, August 2014, page 799; Mineralogical Magazine, 78, 797-804.
Kampf, A.R., Kasatkin, A.V., Čejka, J., Marty, J. (2015): Plášilite, Na(UO2)(SO4)(OH)•2H2O, a new uranyl sulfate mineral from the Blue Lizard mine, San Juan County, Utah, USA. Journal of Geosciences. 60, 1-10

Internet Links for PlášiliteHide

Localities for PlášiliteHide

ⓘ - 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 (TL)
 
  • Utah
    • San Juan Co.
      • White Canyon District
        • Red Canyon
Kampf, A.R., Kasatkin, A.V., Čejka, J. and Marty, J. (2014) Plášilite, IMA 2014-021. CNMNC Newsletter No. 21, August 2014, page 799; Mineralogical Magazine, 78, 797-804.; Kampf, A.R., Kasatkin, A.V., Čejka, J., Marty, J. (2015): Plášilite, Na(UO2)(SO4)(OH)•2H2O, a new uranyl sulfate mineral from the Blue Lizard mine, San Juan County, Utah, USA. Journal of Geosciences. 60, 1-10
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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