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Vysokýite

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About VysokýiteHide

Arnošt Vysoký
Formula:
U4+[AsO2(OH)2]4•4H2O
Colour:
Light-green
Lustre:
Sub-Vitreous
Hardness:
2
Specific Gravity:
3.393
Crystal System:
Triclinic
Name:
Named in honour of Arnošt Vysoký (1823–1872), the former head of the Jáchymov smelters; chemist and metallurgist.
One of the very rare oxysalt minerals containing tetravalent U. Second purely U4+ arsenate mineral after štěpite. Chemically somewhat similar toarsenovanmeersscheite. May be covered by štĕpite and closely associated with bĕhounekite. New structure type. The structure contains UO8 square antiprisms, that have all of their vertices shared with with 8 As-bearing tetrahedra to form infinite chains || [010]. The chains are linked by hydrogen bonds, that involve terminal (OH) groups of the double-protonated As-tetrahedra and inter-chain water molecules.


Classification of VysokýiteHide

Approved
Approval Year:
2012
First Published:
2013

Physical Properties of VysokýiteHide

Sub-Vitreous
Comment:
An alabaster lustre
Colour:
Light-green
Streak:
Greenish-gray to grayish
Hardness:
Comment:
~2
Tenacity:
Brittle
Cleavage:
Perfect
along (100) and (001)
Fracture:
Irregular/Uneven
Density:
3.393 g/cm3 (Measured)    3.34 g/cm3 (Calculated)

Chemical Properties of VysokýiteHide

Formula:
U4+[AsO2(OH)2]4•4H2O
IMA Formula:
U4+[AsO2(OH)2]4 · 4H2O
Common Impurities:
Si

Crystallography of VysokýiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 10.749 Å, b = 5.044 Å, c = 19.1778 Å
α = 89.872°, β = 121.534°, γ = 76.508°
Ratio:
a:b:c = 2.131 : 1 : 3.802
Unit Cell V:
852.1 ų
Z:
2
Morphology:
Fibrous crystals.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.782(100)
8.067(50)
6.399(7)
4.773(6)
3.411(10)
3.197(18)
3.189(11)
3.076(11)
Comments:
From Type Description.

Type Occurrence of VysokýiteHide

General Appearance of Type Material:
Extremely fibrous light-green crystals up to 8 mm long on altered surface of massive native As.
Place of Conservation of Type Material:
Department of Mineralogy and Petrology of the National Museum in Prague, Prague, Czech Republic, catalogue number P1P 1/2012
Associated Minerals at Type Locality:

Synonyms of VysokýiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Štěpite2 photos of Vysokýite associated with Štěpite on mindat.org.
Arsenic1 photo of Vysokýite associated with Arsenic on mindat.org.

Fluorescence of VysokýiteHide

non-fluorescent

Other InformationHide

Notes:
Raman bands [cm–1]: 2750 + 2230 (v O-H stretching of As-OH and of hydrogen-bonded water molecules);
1545 + 1435 (combination bands and/or overtones); highest
intensity bands 920 + 816 (v3 antisymmetric and v1 symmetric
As-O stretching); 769 (As-OH stretching); 595 + 559 (δ As-OH bending); 427, 368 [v4 (δ) O-As-O bending], 324 [v2 (δ) bending]; 200, 184, 99, 61 (lattice modes)
Health Risks:
Radioactive

References for VysokýiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Plášil, J., Fejfarová, K., Hloušek, J., Škoda, R., Novák, M., Sejkora, J., Čejka, J., Veselovský , F., Majzlan, J. (2013) Vysokýite , IMA 2012-067. CNMNC Newsletter No. 15, February 2013, page 9; Mineralogical Magazine: 77: 1-12.
Plásil, J., Fejfarová, K., Hloušek, J., Skoda, R., Novák, M.K., Sejkora, J., Ejka, J.C., Dusek, M., Veselovský, F., Ondrus, P., Majzlan, J.Z., Mrazek, Z. (2013) Štěpite, U(AsO3OH)2.4H2O, from Jáchymov, Czech Republic: the first natural arsenate of tetravalent uranium. Mineralogical Magazine: 77: 137-152. [gives also some info on vysokýite].
Plášil, J., Hloušek, J., Škoda, R., Novák, M., Sejkora, J., Čejka, J., Veselovský, F., Majzlan, J. (2013) Vysokyite, U4+[AsO2(OH)2]4.4H2O, a new mineral from Jáchymov, Czech Republic. Mineralogical Magazine: 77: 3055-3066.

Internet Links for VysokýiteHide

Localities for VysokýiteHide

ⓘ - 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.
Czech Republic
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
Plášil, J., Fejfarová, K., Hloušek, J., Škoda, R., Novák, M., Sejkora, J., Čejka, J., Veselovský , F. and Majzlan, J. (2013) Vysokýite , IMA 2012-067. CNMNC Newsletter No. 15, February 2013, page 9; Mineralogical Magazine, 77, 1-12.
        • Jáchymov (St Joachimsthal)
          • Svornost Mine (Einigkeit Mine)
Plášil, J., Hloušek, J., Škoda, R., Novák, M., Sejkora, J., Čejka, J., Veselovský, F., Majzlan, J. (2013): Vysokyite, U4+[AsO2(OH)2]4{middle dot}4H2O, a new mineral from Jáchymov, Czech Republic. Mineralogical Magazine, 77, 3055-3066
Mineral and/or Locality  
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