Neustädtelite
A valid IMA mineral species
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About Neustädtelite
View of the Neustädtel mining town, ca. 1930.
Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany
Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany
Formula:
Bi2Fe3+(Fe3+,Co)(AsO4)2(O,OH)4
Colour:
Brown, brown-red, black
Lustre:
Adamantine
Hardness:
4½
Specific Gravity:
5.81 (Calculated)
Crystal System:
Triclinic
Name:
For the type locality
Unique Identifiers
Mindat ID:
11011
Long-form identifier:
mindat:1:1:11011:8
GUID
(UUID V4):
(UUID V4):
df44786c-1c76-4830-b862-a4c981e79ecc
IMA Classification of Neustädtelite
Approved
IMA Formula:
Bi2Fe3+(Fe3+,Co)2(O,OH)4(AsO4)2
Approval year:
1998
First published:
2002
Classification of Neustädtelite
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 |
---|---|---|
Neu | 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 Neustädtelite
Adamantine
Transparency:
Transparent, Translucent
Colour:
Brown, brown-red, black
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 Neustädtelite
Type:
Biaxial (-)
RI values:
nα = 2.020 nβ = 2.080 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 Neustädtelite
Mindat Formula:
Bi2Fe3+(Fe3+,Co)(AsO4)2(O,OH)4
Crystallography of Neustädtelite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 4.556 Å, b = 6.153 Å, c = 8.894 Å
α = 95.43°, β = 99.22°, γ = 92.95°
α = 95.43°, β = 99.22°, γ = 92.95°
Ratio:
a:b:c = 0.74 : 1 : 1.445
Unit Cell V:
244.437 ų
Z:
1
Morphology:
Tabular parallel to {001} and slightly to distinctly elongated parallel to [010]. Also {001}, {101}, ~{011}.
Twinning:
None observed.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
8.864 Å | (30) |
3.772 Å | (90) |
3.539 Å | (100) |
3.495 Å | (70) |
2.913 Å | (70) |
2.797 Å | (50) |
2.674 Å | (40) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47d : [Arsenates, antimonates, selenates, bismuthinates] | |
47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Neustädtelite
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 Neustädtelite
Other Language Names for Neustädtelite
Common Associates
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 | Cobaltneustädtelite | Bi2Fe3+(Co,Fe3+)(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 Neustädtelite
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 Neustädtelite
mindat.org URL:
https://www.mindat.org/min-11011.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Neustädtelite
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 Neustädtelite
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.
Czech Republic | |
| Pavel Škácha coll. +1 other reference |
Germany | |
| 90. +1 other reference |
90. +1 other reference | |
Lapis 27 (7/8) | |
| Hajek (2010) |
| Lapis 30 (7/8) |
| Lapis 30 (7/8) |
Lapis 30 (7/8) | |
| Krause et al. (2002) |
Am. Min. 87:726-738 | |
Lapis 30 (7/8) | |
Lapis 30 (7/8) | |
Lapis 30 (7/8) | |
Lapis 30 (7/8) | |
| Am. Min. 87:726-738 |
Lapis 30 (7/8) | |
| Gröbner et al. (2007) +1 other reference |
Spain | |
| Calvo Rebollar et al. (2022) |
| Calvo Rebollar et al. (2022) |
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Güldener Falk Mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany