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Cobaltneustädtelite

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Formula:
Bi23+Fe3+(Co,Fe3+)2(AsO4)2(OH,O)4
System:
Triclinic
Colour:
brown, red-brown
Lustre:
Adamantine
Hardness:
Name:
In allusion to its composition, containing dominant cobalt, and its relationship to Neustädtelite.
The Co2+ analogue of Medenbachite.

Classification of Cobaltneustädtelite

Approved 2000
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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First Recorded Occurrence of Cobaltneustädtelite

Physical Properties of Cobaltneustädtelite

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

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 Data:
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
Max Birefringence:
δ = 0.100
Image 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:
Bi23+Fe3+(Co,Fe3+)2(AsO4)2(OH,O)4
Essential elements:
All elements listed in formula:

Relationship of Cobaltneustädtelite to other Species

8.BK.05BrazilianiteNaAl3(PO4)2(OH)4
8.BK.10MedenbachiteBi23+Fe3+(Cu,Fe3+)(AsO4)2(OH,O)4
8.BK.10NeustädteliteBi23+Fe3+(Fe3+,Co)2(AsO4)2(OH,O)4
8.BK.15CuretoniteBa4Al3Ti(PO4)4(O,OH)6
8.BK.20HeyitePb5Fe22+(VO4)2O4
8.BK.25JamesitePb2Zn(Fe2+,Zn)2Fe43+(AsO4)4(OH)10
8.BK.25LulzaciteSr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10

Other Names for Cobaltneustädtelite

Other Information

Health Risks:
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

Localities for Cobaltneustädtelite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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  
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