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Vajdakite

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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), Jáchymov District (St Joachimsthal), 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
Simplified for copy/paste:[(Mo6+O2)2(H2O)2As3+2O5]·3H2O
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
 
5.9
Mn
 
1.7
Fe
 
3
Ti
 
3
(AsO
 
3
)
 
12
· 4-5H
 
2
O
4.JC.10Lazarenkoite
(Ca,Fe
2+
 
)Fe
3+
 
As
3+
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.

Best Localities for Vajdakite

Best of Species:Vajdakite

Internet Links for Vajdakite

Search Engines:
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  • External Links:
  • Look for Vajdakite on Webmineral
  • Look for Vajdakite on Athena Mineralogy
  • Look for Vajdakite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • rare and unusual minerals mainly crystallized
  • Rare and Unusual minerals at Mineralogical Research Company
  • Buy rare minerals from Excalibur Minerals
  • Search for Vajdakite on Well-Arranged Molecules
  • Localities for Vajdakite

    The 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. ? 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)
          • Jáchymov District (St Joachimsthal)
            • Jáchymov (St Joachimsthal)
    Amer.Min.(2002) 87, 983-990; Lapis 2002(7/8), 62
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