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Vajdakite

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Josef Vajdak
Formula:
[(Mo6+O2)2(H2O)2As3+2O5] · 3H2O
Colour:
Green to grey-green.
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
After Josef Vajdak (born March 31, 1930, in Helena, Montana, USA). American mineral collector and dealer of rare minerals.
An arsenite.


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Classification of VajdakiteHide

Approved
4.JC.20

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 VajdakiteHide

Vitreous
Transparency:
Transparent
Colour:
Green to grey-green.
Streak:
White

Optical Data of VajdakiteHide

Type:
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
Dispersion:
r > v

Chemical Properties of VajdakiteHide

Formula:
[(Mo6+O2)2(H2O)2As3+2O5] · 3H2O
IMA Formula:
(Mo6+O2)2As3+2O5 · 3H2O

Crystallography of VajdakiteHide

Crystal System:
Monoclinic

Type Occurrence of VajdakiteHide

Synonyms of VajdakiteHide

Other Language Names for VajdakiteHide

German:Vajdakit
Spanish:Vajdakita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Nickelhexahydrite2 photos of Vajdakite associated with Nickelhexahydrite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.JC.05CafarsiteCa5.9Mn1.7Fe3Ti3(AsO3)12 · 4-5H2OIso. m3 (2/m 3) : Pn3
4.JC.10Lazarenkoite(Ca,Fe2+)Fe3+As3+3O7 · 3H2OOrth.
4.JC.15RouseitePb2Mn2+[AsO3]2 · 2H2OTric.

Other InformationHide

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 VajdakiteHide

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

Localities for VajdakiteHide

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)
 
  • 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
Mineral and/or Locality  
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