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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Please feel free to link to this page.
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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
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Germany (TL) | |
| |
| |
Spain | |
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Güldener Falk Mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany