Jáchymovite
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About Jáchymovite
Formula:
(UO2)8(SO4)(OH)14 · 13H2O
Colour:
yellow
Lustre:
Vitreous
Specific Gravity:
4.79 (Calculated)
Crystal System:
Monoclinic
Name:
Named for the type locality.
This page provides mineralogical data about Jáchymovite.
Classification of Jáchymovite
Approved
Approval year:
1994
6/D.20-05
7.EA.10
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
A : Without cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
A : Without cations
Physical Properties of Jáchymovite
Vitreous
Colour:
yellow
Streak:
pale yellow
Cleavage:
Very Good
on {010}
on {010}
Fracture:
Conchoidal
Density:
4.79 g/cm3 (Calculated)
Optical Data of Jáchymovite
Type:
Biaxial (-)
RI values:
nα = 1.715 nβ = 1.718 nγ = 1.720
2V:
Calculated: 78°
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v
Chemical Properties of Jáchymovite
Formula:
(UO2)8(SO4)(OH)14 · 13H2O
Elements listed:
Crystallography of Jáchymovite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 18.553(8) Å, b = 9.276(2) Å, c = 13.532(7) Å
β = 125.56(2)°
β = 125.56(2)°
Ratio:
a:b:c = 2 : 1 : 1.459
Unit Cell V:
1,894.52 ų (Calculated from Unit Cell)
Z:
2
Type Occurrence of Jáchymovite
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 Jáchymovite
Other Language Names for Jáchymovite
German:Jáchymovit
Spanish:Jáchymovita
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Jáchymovite associated with Uranopilite | (UO2)6(SO4)O2(OH)6 · 14H2O |
Related Minerals - Nickel-Strunz Grouping
| 7.EA.05 | Metauranopilite | (UO2)6(SO4)(OH)10 · 5H2O | |
| 7.EA.05 | Uranopilite | (UO2)6(SO4)O2(OH)6 · 14H2O | Mon. |
Fluorescence of Jáchymovite
yellow uder both SW and LW UV
Other Information
Health Risks:
radioactive
References for Jáchymovite
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 Jáchymovite
mindat.org URL:
https://www.mindat.org/min-7117.html
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Please feel free to link to this page.
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External Links:
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Localities for Jáchymovite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Czech Republic (TL) | |
| Neues Jahrb.Min.,Abh.(1996) 170, 155-170 |
| 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. |
| 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. |
Switzerland | |
| Am Min 88:4 pp 676-685 |
Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic