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Jáchymovite

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

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Formula:
(UO
 
2
)
 
8
(SO
 
4
)(OH)
 
14
 · 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), Jáchymov (St Joachimsthal) District, 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
(SO
 
4
)(OH)
 
14
 · 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
(SO
 
4
)(OH)
 
10
 · 5H
 
2
O
7.EA.05Uranopilite
(UO
 
2
)
 
6
(SO
 
4
)O
 
2
(OH)
 
6
 · 14H
 
2
O

Other Names for Jáchymovite

Synonyms:
IMA1994-025
Other Languages:
German:Jáchymovit
Spanish: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

    Hide Locality List
    (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
        • Horní Slavkov (Schlaggenwald)
    		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.
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov (St Joachimsthal) District
    		Neues Jahrb.Min.,Abh.(1996) 170, 155-170
    Switzerland
     
    • Wallis (Valais)
      • Le Trient Valley
        • Les Marécottes
    		Am Min 88:4 pp 676-685
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 18th Jun 2011 21:22:36
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