Cobaltneustädtelite
A valid IMA mineral species
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About Cobaltneustädtelite
Formula:
Bi2Fe3+(Co,Fe3+)(AsO4)2(O,OH)4
Colour:
Brown, red-brown
Lustre:
Adamantine
Hardness:
4½
Specific Gravity:
5.81 (Calculated)
Crystal System:
Triclinic
Name:
In allusion to its composition, containing dominant cobalt, and its relationship to neustädtelite.
Unique Identifiers
Mindat ID:
11015
Long-form identifier:
mindat:1:1:11015:4
GUID
(UUID V4):
(UUID V4):
b68593ba-af57-4b60-93d4-43c549a4f7fb
IMA Classification of Cobaltneustädtelite
Approved
Approval year:
2000
First published:
2002
Classification of Cobaltneustädtelite
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
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
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Cneu | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Cobaltneustädtelite
Adamantine
Transparency:
Transparent, Translucent
Colour:
Brown, red-brown
Streak:
Light brown
Hardness:
4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
On {001}
On {001}
Fracture:
Conchoidal
Density:
5.81 g/cm3 (Calculated)
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.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively weak
Pleochroism:
Strong
Comments:
X = brown to opaque, Y = yellow, and Z = pale yellow.
Comments:
X is very near to [010]; for crystals lying on (001) X' shows an oblique extinction of approximately 7° relative to [010].
Chemistry of Cobaltneustädtelite
Mindat Formula:
Bi2Fe3+(Co,Fe3+)(AsO4)2(O,OH)4
Crystallography of Cobaltneustädtelite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.156 Å, b = 6.148 Å, c = 9.338 Å
α = 83.24°, β = 70.56°, γ = 86.91°
α = 83.24°, β = 70.56°, γ = 86.91°
Ratio:
a:b:c = 1.489 : 1 : 1.519
Unit Cell V:
492.172 ų
Z:
2
Morphology:
Tabular parallel to {001} and slightly to distinctly elongated parallel to [010]. Also {001}, {100}, ~{011} and {201}.
Twinning:
None observed.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.757 Å | (50) |
| 3.752 Å | (100) |
| 3.552 Å | (50) |
| 3.507 Å | (40) |
| 2.901 Å | (100) |
| 2.750 Å | (40) |
| 2.667 Å | (70) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Cobaltneustädtelite
General Appearance of Type Material:
Crystal aggregates up to 0.3 mm and very small tabular crystals, mostly <0.1 mm.
Place of Conservation of Type Material:
Staatliches Museum für Mineralogie und Geologie, Dresden, Germany, catalogue numbers 18328 and 18329.
Associated Minerals at Type Locality:
Reference:
Krause, W., Bernhardt, H.-J., McCammon, C. and Effenberger, H. (2002): Neustädtelite and cobaltneustädtelite, the Fe3+- and Co2+- analogues of medenbachite. American Mineralogist, 87, 726-738.
Synonyms of Cobaltneustädtelite
Other Language Names for Cobaltneustädtelite
Related Minerals - Strunz-mindat Grouping
| 8.BK.05 | Brazilianite | NaAl3(PO4)2(OH)4 |
| 8.BK.10 | Medenbachite | Bi2Fe3+Cu2+(AsO4)2O(OH)3 |
| 8.BK.10 | Neustädtelite | Bi2Fe3+(Fe3+,Co)(AsO4)2(O,OH)4 |
| 8.BK.15 | Curetonite | Ba(Al,Ti)(PO4)(OH,O)F |
| 8.BK.20 | Heyite | Pb5Fe2+2(VO4)2O4 |
| 8.BK.25 | Jamesite | Pb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10 |
| 8.BK.25 | Lulzacite | Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10 |
| 8.BK.30 | Nishanbaevite | KAl2O(AsO4)(SO4) |
| 8.BK.35 | Lehmannite | Na18Cu12TiO8(AsO4)8FCl5 |
Fluorescence of Cobaltneustädtelite
Not fluorescent
Other Information
Notes:
Completely soluble in warm, dilute HCl without effervescence.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Cobaltneustädtelite
mindat.org URL:
https://www.mindat.org/min-11015.html
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External Links:
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References for Cobaltneustädtelite
Reference List:
Effenberger, H., Krause, W., Bernhardt, H.-J., McCammon, C. (2000) Substitution of Fe3++O2- ⇔ Co2++(OH)- and ordering of the Bi atoms in Bi2Fe(Fe,Co)(O,OH)2(OH)2(AsO4)2 minerals neustädtelite and cobaltneustädtelite. Acta Crystallographica Section A Foundations of Crystallography, 56. doi:10.1107/s0108767300027525
Localities for Cobaltneustädtelite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Germany (TL) | |
| Krause et al. (2002) |
| Am. Min. 87:726-738 | |
| Lapis 30 (7/8) | |
| Lapis 30 (7/8) | |
| Am. Min. 87:726-738 |
Spain | |
| Schnorrer et al. (2005) |
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Güldener Falk Mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany