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Cobaltneustädtelite

Big Photo

Güldener Falk Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany
© Thomas Witzke

Show Cobaltneustädtelite Photos (2)
Formula:
Bi
3+
2
Fe
3+
 
(Co,Fe
3+
 
)
 
2
[(O,OH)|OH|AsO
 
4
]
 
2
System:TriclinicColour:brown, red-brown
Lustre:AdamantineHardness:4½
Name:In allusion to its composition, containing dominant cobalt, and its relationship to Neustädtelite.


The Co2+ analogue of Medenbachite.

Classification of Cobaltneustädtelite

IMA status:Approved 2000
Strunz 8th edition ID:7/B.37-17
Strunz 9th edition ID:8.BK.10
Nickel-Strunz 10th (pending) edition ID:8.BK.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
K : With medium-sized and large cations, (OH, etc.):RO4 = 2:1, 2.5:1
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Type Occurrence of Cobaltneustädtelite

Type Locality:Güldener Falk Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany

Physical Properties of Cobaltneustädtelite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent, Translucent
Colour:brown, red-brown
Streak:light brown
Hardness (Mohs):4½
Cleavage:Distinct/Good
on {001}
Density (calculated):5.81 g/cm3

Crystallography of Cobaltneustädtelite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 9.156Å, b = 6.148Å, c = 9.338Å
α = 83.24°, β = 70.56°, γ = 86.91°
Ratio:a:b:c = 1.489 : 1 : 1.519
Unit Cell Volume:V 492.172 ų
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
8.757 (50)
3.752 (100)
3.552 (50)
3.507 (40)
2.901 (100)
2.750 (40)

Optical Data of Cobaltneustädtelite

Type:Biaxial (-)
RI values: nα = 2.020 nβ = 2.090 nγ = 2.120
Maximum Birefringence:δ = 0.100

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

Chemical Properties of Cobaltneustädtelite

Formula:
Bi
3+
2
Fe
3+
 
(Co,Fe
3+
 
)
 
2
[(O,OH)|OH|AsO
 
4
]
 
2
Essential elements:As, Bi, Co, Fe, H, O
All elements listed in formula:As, Bi, Co, Fe, H, O

Relationship of Cobaltneustädtelite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BK.05Brazilianite
NaAl
 
3
[(OH)
 
2
|PO
 
4
]
 
2
8.BK.10Medenbachite
Bi
3+
2
Fe
3+
 
(Cu,Fe
3+
 
)[(OH,O)
 
2
|AsO
 
4
]
 
2
8.BK.10Neustädtelite
Bi
3+
2
Fe
3+
 
(Fe
3+
 
,Co)
 
2
[(O,OH)|OH|AsO
 
4
]
 
2
8.BK.15Curetonite
Ba
 
4
Al
 
3
Ti(PO
 
4
)
 
4
(O,OH)
 
6
8.BK.20Heyite
Pb
 
5
Fe
2+
2
[O
 
2
|VO
 
4
]
 
2
8.BK.25Jamesite
Pb
 
2
Zn(Fe
2+
 
,Zn)
 
2
Fe
3+
4
[(OH)
 
10
|(AsO
 
4
)
 
4
]
8.BK.25Lulzacite
Sr
 
2
Fe
2+
 
(Fe
2+
 
,Mg)
 
2
Al
 
4
[(OH)
 
10
|(PO
 
4
)
 
4
]

Other Names for Cobaltneustädtelite

Synonyms:
IMA2000-012
Other Languages:
German:Cobaltneustädtelit
Kobaltneustädtelit
Russian:Кобальтнойштадтелит
Spanish:Cobaltneustädtelita

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 Cobaltneustädtelite

Reference List:Krause, W., H.-J. Bernhardt, C. McCammon & H. Effenberger (2002): Neustädtelite and cobaltneustädtelite, the Fe3+- and Co2+- analogues of medenbachite: American Mineralogist: 87, 726 - 738.

Internet Links for Cobaltneustädtelite

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    Localities for Cobaltneustädtelite

    (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
     
    • Saxony
      • Erzgebirge
        • Schneeberg District
          • Neustädtel
    		W. Krause, H.-J. Bernhardt, C. McCammon & H. Effenberger (2002): Neustädtelite and cobaltneustädtelite, the Fe3+- and Co2+- analogues of medenbachite.- American Mineralogist 87, 726 - 738
    Am. Min. 87:726-738
    Lapis 30(7/8):68-69 (2005)
    Lapis 30(7/8):68-69 (2005)
          • Wolfgang Maaßen Mine field
    		Am. Min. 87:726-738
    Spain
     
    • Andalusia
      • Córdoba
        • Villanueva de Córdoba
    		Schnorrer, G. & Kronz, A. (2005): Cobaltneustädtelit, Metatorbernit, Churchit und Plumbogummit, vier von der ehemaligen Grube Espuela de San Miguel bei Villanueva de Cordoba, Prov. Cordoba in Spanien. Der Aufschluss, 56, 177-182. (in German)
    Mineral and/or Locality
    Google
     
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