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About JáchymoviteHide

(UO2)8(SO4)(OH)14 · 13H2O
Specific Gravity:
4.79 (Calculated)
Crystal System:
Named for the type locality.
This page provides mineralogical data about Jáchymovite.

Classification of JáchymoviteHide

Approval year:

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

Physical Properties of JáchymoviteHide

pale yellow
Very Good
on {010}
4.79 g/cm3 (Calculated)

Optical Data of JáchymoviteHide

Biaxial (-)
RI values:
nα = 1.715 nβ = 1.718 nγ = 1.720
Calculated: 78°
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r > v

Chemical Properties of JáchymoviteHide

(UO2)8(SO4)(OH)14 · 13H2O

Crystallography of JáchymoviteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 18.553(8) Å, b = 9.276(2) Å, c = 13.532(7) Å
β = 125.56(2)°
a:b:c = 2 : 1 : 1.459
Unit Cell V:
1,894.52 ų (Calculated from Unit Cell)

Type Occurrence of JáchymoviteHide

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

Synonyms of JáchymoviteHide

Other Language Names for JáchymoviteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Jáchymovite associated with Uranopilite(UO2)6(SO4)O2(OH)6 · 14H2O

Related Minerals - Nickel-Strunz GroupingHide

7.EA.05Metauranopilite(UO2)6(SO4)(OH)10 · 5H2O
7.EA.05Uranopilite(UO2)6(SO4)O2(OH)6 · 14H2OMon.

Fluorescence of JáchymoviteHide

yellow uder both SW and LW UV

Other InformationHide

Health Risks:

References for JáchymoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 JáchymoviteHide

Localities for JáchymoviteHide

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.
Czech Republic (TL)
  • Karlovy Vary Region
    • Karlovy Vary District
Neues Jahrb.Min.,Abh.(1996) 170, 155-170
        • Rovnost Mine (Werner Mine)
Škácha, Pavel; Horák, Vladimír; Plašil, Jakub (2014) Minerals and finds of ore shoots on the Geister vein of the western part of the Jáchymov ore district (Czech Republic). Bulletin Mineralogicko-Petrologickeho Oddeleni Narodniho Muzea v Praze Vol. 22 Issue 2, p202-202. 1p.
    • Sokolov District
      • Horní Slavkov
Sejkora, J. & Plasil, J. (2009): Mineralien aus dem Uranrevier Horni Slavkov. Lapis 34 (7-8), 63-67; 70 (in German).; Plášil, J., Tvrdý, J.: Uranopilit a jáchymovit z uranového ložiska Horní Slavkov. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 2008, vol. 16, 1, 61-64.
  • Valais
    • Saint-Maurice
      • Salvan
        • Les Marécottes
          • La Creusaz
Am Min 88:4 pp 676-685
Mineral and/or Locality  
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