Daubréeite
A valid IMA mineral species - grandfathered
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About Daubréeite
Auguste Daubree
Formula:
BiO(OH)
Colour:
Creamy-white, greyish, yellowish-brown; colourless in transmitted light.
Lustre:
Greasy, Silky
Hardness:
2 - 2½
Specific Gravity:
6.4 - 6.5
Crystal System:
Tetragonal
Member of:
Name:
Named by I. Domeyko in 1876 in honor of Gabriel Auguste Daubrée (25 June 1814, Metz, France – 29 May 1896, Paris, France), mineralogist, geologist and professor at Strasbourg and the Museum d'Histoire Naturelle, Paris. He was awarded the Wollaston Medal in 1880. The mineral daubréelite is also named in his honor.
Name Encoding
ASCII-7:
Daubreeite
Unique Identifiers
Mindat ID:
1229
Long-form identifier:
mindat:1:1:1229:0
Similar Names
| Dauberite | A synonym of Zippeite | |
| Daubréelite | A valid IMA mineral species - grandfathered | Fe2+Cr23+S4 |
IMA Classification of Daubréeite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Bi3+O(OH)
First published:
1876
Classification of Daubréeite
4.F0.25
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
0 :
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
0 :
10.2.1.3
10 : OXYHALIDES AND HYDROXYHALIDES
2 : A(O,OH)Xq
10 : OXYHALIDES AND HYDROXYHALIDES
2 : A(O,OH)Xq
8.9.6
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
9 : Halides of Sb and Bi
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
9 : Halides of Sb and Bi
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 |
|---|---|---|
| Dau | 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 Daubréeite
Greasy, Silky
Transparency:
Transparent
Colour:
Creamy-white, greyish, yellowish-brown; colourless in transmitted light.
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Waxy
Cleavage:
Perfect
On {001}
On {001}
Comment:
Very plastic
Density:
6.4 - 6.5 g/cm3 (Measured) 7.70 g/cm3 (Calculated)
Optical Data of Daubréeite
Type:
Uniaxial (-)
RI values:
nω = 2.15 nε = 1.91
Max. Birefringence:
δ = 0.240
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:
Very 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 uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Chemistry of Daubréeite
Mindat Formula:
BiO(OH)
Elements listed:
Crystallography of Daubréeite
Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
P4/nmm
Cell Parameters:
a = 3.85 Å, c = 7.4 Å
Ratio:
a:c = 1 : 1.922
Unit Cell V:
109.69 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Massive only; compact, earthy, columnar to platy-fibrous.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.66 Å | (strong) |
| 1.672 Å | (strong) |
| 2.72 Å | (moderately strong) |
| 1.562 Å | (moderately strong) |
| 7.35 Å | (moderate) |
| 1.259 Å | (moderate) |
| 3.70 Å | (weak) |
Comments:
Tazna, Bolivia.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45b : [Other oxidized fumarolic minerals] | |
| 47a : [Near-surface hydration of prior minerals] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Daubréeite
Place of Conservation of Type Material:
Geowissenschaftliches Zentrum, Georg August Universität, Göttingen, Germany, number GZG.MIN.3.3.63.1.
Muséum Nationale d’Histoire Naturelle, Paris, France, number 94.247.
Ecole Nationale Supérieure des Mines, Paris, France, numbers 786, 9110, 50737.
Muséum Nationale d’Histoire Naturelle, Paris, France, number 94.247.
Ecole Nationale Supérieure des Mines, Paris, France, numbers 786, 9110, 50737.
Geological Setting of Type Material:
Oxidation zone of bismuth deposit.
Associated Minerals at Type Locality:
Synonyms of Daubréeite
Other Language Names for Daubréeite
Dutch:Daubréeiet
Russian:Добрееит
Simplified Chinese:羟氯铋矿
Spanish:Daubréeita
Daubreita
Daubreita
Traditional Chinese:羥氯鉍礦
Relationship of Daubréeite to other Species
Member of:
Other Members of Matlockite Group:
| Bismoclite | BiOCl | Tet. 4/mmm(4/m2/m2/m) : P4/nmm |
| Laurionite | PbCl(OH) | Orth. mmm(2/m2/m2/m) |
| Matlockite | PbFCl | Tet. 4/mmm(4/m2/m2/m) : P4/nmm |
| Paralaurionite | PbCl(OH) | Mon. 2/m : B2/m |
| Rorisite | CaFCl | Tet. 4/mmm(4/m2/m2/m) : P4/nmm |
| Zavaritskite | (BiO)F | Tet. 4/mmm(4/m2/m2/m) : P4/nmm |
Common Associates
Associations Based on Photo Data:
| 2 photos of Daubréeite associated with Bismuthinite | Bi2S3 |
| 1 photo of Daubréeite associated with Uakitite | VN |
| 1 photo of Daubréeite associated with 'Kamacite' | (Fe,Ni) |
| 1 photo of Daubréeite associated with Troilite | FeS |
| 1 photo of Daubréeite associated with Schreibersite | (Fe,Ni)3P |
| 1 photo of Daubréeite associated with Magnetite | Fe2+Fe3+2O4 |
| 1 photo of Daubréeite associated with Quartz | SiO2 |
| 1 photo of Daubréeite associated with Goethite | Fe3+O(OH) |
| 1 photo of Daubréeite associated with Bismoclite | BiOCl |
Other Information
Notes:
Totally soluble in acids. Re-precipitates upon substantial dilution.
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 Daubréeite
mindat.org URL:
https://www.mindat.org/min-1229.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 Daubréeite
Localities for Daubréeite
Showing 17 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.
Australia | |
| Simpson |
Bolivia | |
| Wilson (2001) |
| Domeyko (1876) +1 other reference |
| Wilson (2001) |
Canada | |
| Barkov et al. (2008) |
Czech Republic | |
| Tuček K.: Meteority a jejich výskyt v ... |
France | |
| Patrice Queneau Collection. Visual ... |
Italy | |
| G. Marinelli (Isola d'Elba) |
Japan | |
| Nagashima et al. (2021) |
Norway | |
| Husdal (2019) |
Russia | |
| Barkov et al. (2018) |
| Kurguzova et al. (2014) |
Spain | |
| Sainz de Baranda Graf et al. (2023) |
USA | |
| Castor et al. (2004) |
| Foord et al. (1988) +1 other reference |
| Dr. Frank Keutsch specimen (microinclusion in awaruite nugget) |
| Means et al. (1916) +3 other references |
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Cerro Tazna, Cotagaita Municipality, Nor Chichas Province, Potosí, Bolivia