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Josef Vajdak
[(Mo6+O2)2(H2O)2As23+O5] · 3H2O
Green to grey-green.
After Josef Vajdak (born March 31, 1930, in Helena, Montana, USA). American mineral collector and dealer of rare minerals.
An arsenite.

Classification of Vajdakite


4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
C : Arsenites, antimonites, bismuthites; without additional anions, with H2O

Physical Properties of Vajdakite

Diaphaneity (Transparency):
Green to grey-green.

Optical Data of Vajdakite

Biaxial (+)
RI values:
nα = 1.757 nβ = 1.778 nγ = 2.040
Max Birefringence:
δ = 0.283
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
r > v

Chemical Properties of Vajdakite

[(Mo6+O2)2(H2O)2As23+O5] · 3H2O
IMA Formula:
(Mo6+O2)2As23+O5 · 3H2O
Elements listed in formula:

Crystallography of Vajdakite

Crystal System:

Type Occurrence of Vajdakite

Relationship of Vajdakite to other Species

4.JC.05CafarsiteCa5.9Mn1.7Fe3Ti3(AsO3)12 · 4-5H2O
4.JC.10Lazarenkoite(Ca,Fe2+)Fe3+As33+O7 · 3H2O
4.JC.15RouseitePb2Mn2+[AsO3]2 · 2H2O

Other Names for Vajdakite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Vajdakite

Reference List:
Ondruš, P., Veselovský, F., Skála, R., Císarová, I., Hloušek, J., Frýda, J., Vavrín, I., Čejka, J. and Gabašová, A. (1997): New naturally occurring phases of secondary origin from Jáchymov (Joachimsthal). J. Czech Geol. Soc. 42, 77-107. [as unnamed phase]

American Mineralogist (2002): 7: 983-990.

Internet Links for Vajdakite URL:
Please feel free to link to this page.

Localities for Vajdakite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
          • Jáchymov (St Joachimsthal)
Amer.Min.(2002) 87, 983-990; Lapis 2002(7/8), 62
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