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Jáchymovite

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Jáchymov (St Joachimsthal), Ostrov, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
© Thomas Witzke

Show Jáchymovite Photos (2)
Formula:
(UO
 
2
)
 
8
[(OH)
 
14
|SO
 
4
] · 13H
 
2
O
System:MonoclinicColour:yellow
Lustre:Vitreous
This page provides mineralogical data about Jáchymovite.

Classification of Jáchymovite

IMA status:Approved 1994
Strunz 8th edition ID:6/D.20-05
Nickel-Strunz 10th (pending) edition ID:7.EA.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
A : Without cations
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Type Occurrence of Jáchymovite

Type Locality:Jáchymov (St Joachimsthal), Ostrov, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
General Appearance of Type Material:as crusts of acicular crystals, to 0.1 mm
Place of Conservation of Type Material:Natural History Museum, Prague, Czech Republic

Physical Properties of Jáchymovite

Lustre:Vitreous
Colour:yellow
Streak:pale yellow
Cleavage:Very Good
on {010}
Fracture:Conchoidal
Density (calculated):4.79 g/cm3

Crystallography of Jáchymovite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m (P1 1 21/m) [P21/m] {P1 21/m 1}
Cell Parameters:a = 18.553(8) Å, b = 9.276(2) Å, c = 13.532(7) Å
β = 125.56(2)°
Ratio:a:b:c = 2 : 1 : 1.459
Unit Cell Volume:V 1,894.52 ų (Calculated from Unit Cell)
Z:2

Optical Data of Jáchymovite

Type:Biaxial (-)
RI values: nα = 1.715 nβ = 1.718 nγ = 1.720
2V:Calculated: 78°
Maximum Birefringence:δ = 0.005

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r > v

Chemical Properties of Jáchymovite

Formula:
(UO
 
2
)
 
8
[(OH)
 
14
|SO
 
4
] · 13H
 
2
O
Essential elements:H, O, S, U
All elements listed in formula:H, O, S, U

Relationship of Jáchymovite to other Species

Related Minerals - Nickel-Strunz Grouping):
7.EA.05Meta-uranopilite
(UO
 
2
)
 
6
[(OH)
 
10
|SO
 
4
] · 5H
 
2
O
7.EA.05Uranopilite
(UO
 
2
)
 
6
[(OH)
 
10
|SO
 
4
] · 12H
 
2
O

Other Names for Jáchymovite

Synonyms:
IMA1994-025
German names:
Jáchymovit
Spanish names:
Jáchymovita

Other Information

Fluorescence in UV light:yellow uder both SW and LW UV
Health Warning:radioactive

References for Jáchymovite

Reference List:Čejka, J., Sejkora, J., Mrazek, Z., Urbanec, Z. and Jarchovky, T. (1996): Jáchymovite, (UO2)8(SO4)(OH)14.13H2O, a new uranyl mineral from Jáchymov, the Krusne Hory Mts., Czech Republic, and its comparison with uranopilite. Neues Jahrbuch für Mineralogie, Abhandlungen: 170, 155-170.

Mineralogical Record: 28: 142-143.

Internet Links for Jáchymovite

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    Localities for Jáchymovite

    (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.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Ostrov
    		Neues Jahrb.Min.,Abh.(1996) 170, 155-170
    Switzerland
     
    • Wallis (Valais)
      • Le Trient Valley
        • Les Marécottes
    		Am Min 88:4 pp 676-685
    Mineral and/or Locality
    Google
     
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