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Vajdakite

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Svornost Mine (Einigkeit Mine), Jáchymov (St Joachimsthal), Ostrov, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
© 2008, J. Weissman

Show Vajdakite Photos (7)
Formula:
[(Mo
6+
 
O
 
2
)
 
2
(H
 
2
O)
 
2
As
3+
2
O
 
5
]·3H
 
2
O
System:MonoclinicColour:Green to grey-green.
Lustre:Vitreous
Name:After Josef Vajdak, American mineral collector and dealer of rare minerals.


An arsenite.

Classification of Vajdakite

IMA status:Approved
Nickel-Strunz 10th (pending) edition ID: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
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Type Occurrence of Vajdakite

Type Locality:Svornost Mine (Einigkeit Mine), Jáchymov (St Joachimsthal), Ostrov, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Physical Properties of Vajdakite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Green to grey-green.
Streak:White

Crystallography of Vajdakite

Crystal System:Monoclinic

Optical Data of Vajdakite

Type:Biaxial (+)
RI values: nα = 1.757 nβ = 1.778 nγ = 2.040
Maximum Birefringence:δ = 0.283

Chart 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 Vajdakite

Formula:
[(Mo
6+
 
O
 
2
)
 
2
(H
 
2
O)
 
2
As
3+
2
O
 
5
]·3H
 
2
O
Essential elements:As, H, Mo, O
All elements listed in formula:As, H, Mo, O

Relationship of Vajdakite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JC.05Cafarsite
Ca
 
8
(Ti,Fe,Fe,Mn)
 
6-7
(AsO
 
3
)
 
12
·4H
 
2
O
4.JC.10Lazarenkoite
(Ca,Fe)FeAs
 
3
O
 
7
·3H
 
2
O
4.JC.15Rouseite
Pb
 
2
Mn
2+
 
[AsO
 
3
]
 
2
 · 2H
 
2
O

Other Names for Vajdakite

Synonyms:
IMA1998-031
Other Languages:
German:Vajdakit
Russian:Вайдакит
Spanish:Vajdakita

Other Information

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

Internet Links for Vajdakite

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  • Raman and XRD data at RRUFF project
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    Localities for Vajdakite

    (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
        • Krušné Hory Mts (Erzgebirge)
          • Ostrov
            • Jáchymov (St Joachimsthal)
    		Amer.Min.(2002) 87, 983-990; Lapis 2002(7/8), 62
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