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Vajdakite

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

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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 (St Joachimsthal) District, 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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    • Localities for Vajdakite

    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
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov (St Joachimsthal) District
            • Jáchymov (St Joachimsthal)
    		Amer.Min.(2002) 87, 983-990; Lapis 2002(7/8), 62
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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 23:05:25
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