Chudobaite
A valid IMA mineral species
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About Chudobaite
Formula:
Mg5(AsO4)2(AsO3OH)2 · 10H2O
In the type material, some Mg is replaced by Zn.
Colour:
Rose, white, colorless
Hardness:
2½ - 3
Specific Gravity:
2.94
Crystal System:
Triclinic
Member of:
Name:
Named for Karl Franz Johann Chudoba (10 August 1898, Wratzow, Moravia - 14 March 1976, Göttingen, Germany) was a mineralogist and petrologist and rector of the Rheinische Friedrich-Wilhelms-Universität in Bonn, Germany. Pronounced koo-dō-baite.
Unique Identifiers
Mindat ID:
1043
Long-form identifier:
mindat:1:1:1043:2
IMA Classification of Chudobaite
Approved
IMA Formula:
Mg5(As5+O4)2(As5+O3OH)2·10H2O
First published:
1960
Classification of Chudobaite
8.CE.05
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
39.2.6.1
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
20.3.16
20 : Arsenates (also arsenates with phosphate, but without other anions)
3 : Arsenates of Zn, Cd or Hg
20 : Arsenates (also arsenates with phosphate, but without other anions)
3 : Arsenates of Zn, Cd or Hg
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 for Standard |
|---|---|---|
| Cdb | 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 Chudobaite
Transparency:
Transparent
Comment:
Good
Colour:
Rose, white, colorless
Hardness:
2½ - 3 on Mohs scale
Cleavage:
Very Good
{010} very good. {100} good.
{010} very good. {100} good.
Density:
2.94 g/cm3 (Measured) 2.93 g/cm3 (Calculated)
Optical Data of Chudobaite
Type:
Biaxial (-)
RI values:
nα = 1.583 nβ = 1.608 nγ = 1.633
2V:
Measured: 79° , Calculated: 88°
Max. Birefringence:
δ = 0.050
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
small
Chemistry of Chudobaite
Mindat Formula:
Mg5(AsO4)2(AsO3OH)2 · 10H2O
In the type material, some Mg is replaced by Zn.
In the type material, some Mg is replaced by Zn.
Element Weights:
Elements listed:
Common Impurities:
Zn
Crystallography of Chudobaite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.69 Å, b = 11.37 Å, c = 6.59 Å
α = 115.2°, β = 95.9°, γ = 94.1°
α = 115.2°, β = 95.9°, γ = 94.1°
Ratio:
a:b:c = 0.676 : 1 : 0.58
Unit Cell V:
514.33 ų (Calculated from Unit Cell)
Z:
1
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0019226 | Chudobaite | Dorner R, Weber K (1976) Die Kristallstruktur von Chudobait, (Mg,Zn)5H2[AsO4]4*10H2O because they were missing negative signs Naturwissenschaften 63 243-243 | 1976 | Tsumeb mine, Tsumeb, Namibia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.16 Å | (10) |
| 2.979 Å | (9) |
| 3.440 Å | (8) |
| 3.273 Å | (8) |
| 2.730 Å | (7) |
| 3.859 Å | (5) |
| 3.746 Å | (5) |
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] |
Type Occurrence of Chudobaite
General Appearance of Type Material:
Crystals equant, to 5 mm
Place of Conservation of Type Material:
National School of Mines, Paris, France.
National Museum of Natural History, Washington, D.C., USA, 162628.
National Museum of Natural History, Washington, D.C., USA, 162628.
Associated Minerals at Type Locality:
Other Language Names for Chudobaite
Relationship of Chudobaite to other Species
Member of:
Other Members of Ondrušite Group:
Common Associates
Associations Based on Photo Data:
| 2 photos of Chudobaite associated with Picropharmacolite | Ca4Mg(AsO4)2(HAsO4)2 · 11H2O |
| 2 photos of Chudobaite associated with Erythrite | Co3(AsO4)2 · 8H2O |
| 1 photo of Chudobaite associated with Symplesite | Fe2+3(AsO4)2 · 8H2O |
| 1 photo of Chudobaite associated with Zincolivenite | CuZn(AsO4)(OH) |
| 1 photo of Chudobaite associated with Pharmacolite | Ca(HAsO4) · 2H2O |
| 1 photo of Chudobaite associated with Maghrebite | MgAl2(AsO4)2(OH)2 · 8H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CE. | Monteneroite | Cu2+Mn2+2(AsO4)2 · 8H2O |
| 8.CE. | Belmonteite | CaMn2(AsO4)2 · 7H2O |
| 8.CE.X | Babánekite | Cu3(AsO4)2 · 8H2O |
| 8.CE.05 | Geigerite | Mn2+5(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.10 | Newberyite | Mg(PO3OH) · 3H2O |
| 8.CE.10 | Manganonewberyite | Mn(PO3OH)(H2O)3 |
| 8.CE.15 | Fanguangite | (MoO2)(PO3OH) · 4H2O |
| 8.CE.15 | Brassite | Mg(HAsO4) · 4H2O |
| 8.CE.20 | Phosphorrösslerite | Mg(PO3OH) · 7H2O |
| 8.CE.20 | Rösslerite | Mg(HAsO4) · 7H2O |
| 8.CE.25 | Switzerite | Mn2+3(PO4)2 · 7H2O |
| 8.CE.25 | Metaswitzerite | Mn2+3(PO4)2 · 4H2O |
| 8.CE.30 | Pradetite | CoCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Klajite | MnCu4(AsO4)2(HAsO4)2 · 9-10H2O |
| 8.CE.30 | Hloušekite | (Ni,Co)Cu4(AsO4)2(AsO3OH)2 · 9H2O |
| 8.CE.30 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.35 | Bobierrite | Mg3(PO4)2 · 8H2O |
| 8.CE.40 | Barićite | (Mg,Fe)3(PO4)2 · 8H2O |
| 8.CE.40 | Parasymplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Gritsenkoite | CoMg2(AsO4)2(H2O)8 |
| 8.CE.40 | Cabrerite | NiMg2(AsO4)2 · 8H2O |
| 8.CE.40 | Pakhomovskyite | Co3(PO4)2 · 8H2O |
| 8.CE.40 | Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O |
| 8.CE.40 | Arupite | Ni3(PO4)2 · 8H2O |
| 8.CE.40 | Erythrite | Co3(AsO4)2 · 8H2O |
| 8.CE.40 | Hörnesite | Mg3(AsO4)2 · 8H2O |
| 8.CE.40 | Manganohörnesite | Mn2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Köttigite | Zn3(AsO4)2 · 8H2O |
| 8.CE.40 | Ferrisymplesite | Fe3+3(AsO4)2(OH)3 · 5H2O |
| 8.CE.40 | Annabergite | Ni3(AsO4)2 · 8H2O |
| 8.CE.45 | Symplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.50 | Cattiite | Mg3(PO4)2 · 22H2O |
| 8.CE.55 | Koninckite | Fe3+PO4 · 3H2O |
| 8.CE.60 | Kaňkite | FeAsO4 · 3.5H2O |
| 8.CE.60 | Hilarionite | Fe3+2(SO4)(AsO4)(OH) · 6H2O |
| 8.CE.65 | Steigerite | Al(VO4) · 3H2O |
| 8.CE.70 | Metaschoderite | Al2(PO4)(VO4) · 6H2O |
| 8.CE.70 | Schoderite | Al2(PO4)(VO4) · 8H2O |
| 8.CE.75 | Zigrasite | MgZr(PO4)2 · 4H2O |
| 8.CE.75 | 'UM2009-11-PO:CaHZr' | CaZr[PO4]2 · 4H2O |
| 8.CE.75 | Malhmoodite | FeZr(PO4)2 · 4H2O |
| 8.CE.80 | Santabarbaraite | Fe3+3(PO4)2(OH)3 · 5H2O |
| 8.CE.85 | Metaköttigite | (Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH) |
| 8.CE.90 | Slavkovite | Cu13(AsO4)6(AsO3OH)4 · 23H2O |
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.
Internet Links for Chudobaite
mindat.org URL:
https://www.mindat.org/min-1043.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Chudobaite
Reference List:
Fleischer, M., Rooseboom, E. H., Skinner, Brian (1960) New Mineral Names; New data; Discredited minerals. American Mineralogist, 45 (9-10) 1130-1136
(1962) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (258) 260-263 doi:10.1180/minmag.1962.033.258.09
Dorner, R.; Weber, K. (1976) Die Kristallstruktur von Chudobait, (Mg, Zn)5H2[AsO4]4·10H2O. Die Naturwissenschaften, 63 (5). 243 doi:10.1007/bf00610915
Fleischer, Michael, Cabri, Louis J., Nickel, Ernest H., Pabst, Adolf (1977) New Mineral Names. American Mineralogist, 62 (5-6) 593-600
Localities for Chudobaite
Showing 6 localities.
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.
Chile | |
| Kampf et al. (2013) |
Germany | |
| Möhn et al. (08/2020) |
Morocco | |
| Favreau et al. (2019) |
| www.mindat.org (n.d.) |
| Favreau et al. (2019) | |
Namibia (TL) | |
| Strunz (1960) +1 other reference |
Quick NavTopAbout ChudobaiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Vein No. 54, Aït Ahmane, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco