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Straczekite

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Union Carbide Mine, Wilson Springs (Potash Sulfur Springs), Garland Co., Arkansas, USA
© Thomas Witzke

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Formula:
(Ca,K,Ba)V
 
8
O
 
20
·3H
 
2
O
System:MonoclinicColour:Green-black
Hardness:1 - 2
Name:Named after John A. Straczek, chief geologist, Union Carbide Corporation.


Straczekite Group

Classification of Straczekite

IMA status:Approved 1983
Strunz 8th edition ID:4/G.11-30
Nickel-Strunz 10th (pending) edition ID:4.HE.20

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
Dana 8th edition ID:47.3.2.1

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
Hey's CIM Ref.:21.2.15

21 : Vanadates (and vanadates with arsenate or phosphate)
2 : Vanadates of Mg, Ca, Sr or Ba
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Type Occurrence of Straczekite

Type Locality:North Wilson pit, Union Carbide Mine, Wilson Springs (Potash Sulfur Springs), Garland Co., Arkansas, USA
Year of Discovery:1984

Physical Properties of Straczekite

Lustre:Greasy
Colour:Green-black
Hardness (Mohs):1 - 2

Crystallography of Straczekite

Crystal System:Monoclinic
Cell Parameters:a = 11.67Å, b = 3.66Å, c = 10.63Å
β = 100.53°
Ratio:a:b:c = 3.189 : 1 : 2.904
Unit Cell Volume:V 446.38 ų (Calculated from Unit Cell)

Optical Data of Straczekite

Type:Biaxial (-)
RI values: nα = 2.000
Maximum Birefringence:δ = 2.000

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:relatively weak

Chemical Properties of Straczekite

Formula:
(Ca,K,Ba)V
 
8
O
 
20
·3H
 
2
O
Essential elements:Ca, H, O, V
All elements listed in formula:Ba, Ca, H, K, O, V

Relationship of Straczekite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.HE.05Melanovanadite
Ca
 
2
V
 
4
V
 
6
O
 
25
·nH
 
2
O
4.HE.10Shcherbinaite
V
 
2
O
 
5
4.HE.15Hewettite
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 9H
 
2
O
4.HE.15Metahewettite
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 3H
 
2
O
4.HE.20Bariandite
Al
 
3
[(V
5+
 
,V
4+
 
)
 
4
O
 
10
]
 
10
 · 45H
 
2
O
4.HE.20Bokite
(Al,Fe
3+
 
)
 
1.3
[(V
5+
 
,V
4+
 
,Fe
3+
 
)
 
4
O
 
10
]
 
2
 · 7.5H
 
2
O
4.HE.20Corvusite
V
 
7
O
 
20
·nH
 
2
O
4.HE.20Fernandinite
(Ca,K)[(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
4
O
 
10
]
 
2
 · 4H
 
2
O
4.HE.25Häggite
V
 
2
O
 
2
(OH)
 
3
4.HE.30Doloresite
3V
 
2
O
 
4
·4H
 
2
O
4.HE.35Duttonite
VO(OH)
 
2
4.HE.40Cavoite
CaV
 
3
O
 
7
Related Minerals - Hey's Index Grouping:

- +
21.2.1Metarossite
Ca[V
 
2
O
 
6
] · 2H
 
2
O
21.2.2Rossite
Ca[V
 
2
O
 
6
] · 4H
 
2
O
21.2.3Metahewettite
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 3H
 
2
O
21.2.4Hewettite
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 9H
 
2
O
21.2.5Pintadoite
Ca
 
2
V
 
2
O
 
7
·9H
 
2
O
21.2.6Hendersonite
(Ca,Sr)
 
x
(V
5+
 
,V
4+
 
)
 
12
O
 
32
·12H
 
2
O (x about 2.6)
21.2.7Fernandinite
(Ca,K)[(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
4
O
 
10
]
 
2
 · 4H
 
2
O
21.2.8Pascoite
Ca
 
3
[V
 
10
O
 
28
] · 17H
 
2
O
21.2.9Sherwoodite
Ca
 
9
Al
 
2
V
 
4
V
 
24
O
 
80
·56H
 
2
O
21.2.10Melanovanadite
Ca
 
2
V
 
4
V
 
6
O
 
25
·nH
 
2
O
21.2.11Grantsite
(Na
 
2
,Ca)[V
 
2
O
 
6
|(V
5+
 
,V
4+
 
)
 
4
O
 
10
] · 4H
 
2
O
21.2.12Hummerite
K
 
2
Mg
 
2
[V
 
10
O
 
28
] · 16H
 
2
O
21.2.13Metadelrioite
CaSr[(OH)
 
2
|V
 
2
O
 
6
]
21.2.14Delrioite
CaSr[(OH)
 
2
|V
 
2
O
 
6
] · 3H
 
2
O
21.2.16Gamagarite
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)[OH|(VO
 
4
)
 
2
]

Other Names for Straczekite

Synonyms:
IMA1983-028
Other Languages:
German:Straczekit
Spanish:Straczekita

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 Straczekite

Reference List:Evans, H. T., Jr., Nord, G., Marinenko, J. and Milton, C. (1984): Straczekite, a new calcium barium potassium vanadate mineral from Wilson Springs, Arkansas. Mineralogical Magazine: 48: 289-293.

American Mineralogist (1985): 70: 877.

American Mineralogist (1990): 75: 508-521.

Internet Links for Straczekite

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    Localities for Straczekite

    Hide Locality List
    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.
    Germany
     
    • Thuringia
      • Gera
        • Ronneburg U deposit
    		T. Witzke et al. (2001) American Mineralogist 86, 1081-1086
    USA
     
    • Arizona
      • Apache Co.
        • Navajo Indian Reservation
          • Monument Valley
            • Monument No. 2 channel
    		Evans, H. and J. Hughes (1990) Crystal chemistry of the natural vanadium bronzes. American Mineralogist: 75: 508-521; Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 8.
    • Arkansas
      • Garland Co.
        • Wilson Springs (Potash Sulfur Springs)
          • Union Carbide Mine
    		R&M 70:3 pp 154-170; Mineralogical Magazine 1984 48 : 289-293
    • Utah
      • San Juan Co.
        • Paradox Valley
          • Paradox Valley District
    Mineral and/or Locality
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