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Cobaltneustädtelite

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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
(AsO
 
4
)
 
2
(OH,O)
 
4
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)
2.667 (70)

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

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

    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.
    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)
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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: 19th Jun 2011 11:19:28
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