Jáchymovite
A valid IMA mineral species
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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.
Unique Identifiers
Mindat ID:
7117
Long-form identifier:
mindat:1:1:7117:4
GUID
(UUID V4):
(UUID V4):
851f11c4-5e69-4333-930f-779587bb8ad5
IMA Classification of Jáchymovite
Classification of Jáchymovite
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
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Jác | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Jáchymovite
Vitreous
Colour:
Yellow
Streak:
Pale yellow.
Tenacity:
Brittle
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(2) nβ = 1.718(2) nγ = 1.720(2)
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
Pleochroism:
Visible
Comments:
Y = pale yellow; Z = yellow.
Chemistry of Jáchymovite
Mindat 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
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.56 Å | (100) |
| 7.13 Å | (48) |
| 3.771 Å | (34) |
| 3.554 Å | (20) |
| 3.234 Å | (10) |
| 3.206 Å | (13) |
Comments:
Jáchymov, Czech Republic. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47f : [Uranyl (U⁶⁺) minerals] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
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.
Geological Setting of Type Material:
Oxidation zone of a uranium deposit.
Associated Minerals at Type Locality:
Synonyms of Jáchymovite
Other Language Names for Jáchymovite
German:Jáchymovit
Spanish:Jáchymovita
Common Associates
Associated Minerals Based on Photo Data:
| 2 photos of Jáchymovite associated with Kroupaite | KPb0.5[(UO2)8O4(OH)10] · 10H2O |
| 1 photo of Jáchymovite associated with Uranopilite | (UO2)6(SO4)O2(OH)6 · 14H2O |
| 1 photo of Jáchymovite associated with Rabejacite | Ca(UO2)4(SO4)2(OH)6 · 6H2O |
| 1 photo of Jáchymovite associated with Johannite | Cu(UO2)2(SO4)2(OH)2 · 8H2O |
| 1 photo of Jáchymovite associated with Redcanyonite | (NH4)2Mn[(UO2)4O4(SO4)2](H2O)4 |
Related Minerals - Strunz-mindat Grouping
| 7.EA. | Scenicite | [(UO2)(H2O)2(SO4)]2 · 3H2O |
| 7.EA.05 | Metauranopilite | (UO2)6(SO4)(OH)10 · 5H2O |
| 7.EA.05 | Uranopilite | (UO2)6(SO4)O2(OH)6 · 14H2O |
| 7.EA.15 | Shumwayite | (UO2)2(SO4)2 · 5H2O |
Fluorescence of Jáchymovite
Yellow under both SW and LW UV.
Other Information
Health Risks:
Radioactive.
Internet Links for Jáchymovite
mindat.org URL:
https://www.mindat.org/min-7117.html
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References for Jáchymovite
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 references and 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) | |
| Čejka et al. (1996) +1 other reference |
| Möhn et al. (12/2021) | |
| Škácha et al. (2014) |
| Desor (04/2022) |
| 70 (in German) +2 other references |
Germany | |
| Mangold et al. (10/21) |
| Gerstenberg et al. (11/21) +1 other reference |
Switzerland | |
| Brugger et al. (2003) |
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Jan Evangelista vein, Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic