Daubreeite Mineral Data
General Daubreeite Information
Chemical Formula:
BiO(OH,Cl)
Composition:
Molecular Weight = 251.21 gm
Bismuth 83.19 % Bi 92.74 % Bi2 O3
Hydrogen 0.20 % H 1.79 % H2 O
Chlorine 7.06 % Cl 7.06 % Cl
- %
Cl -1.59 % -O=Cl2
Oxygen 9.55 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
BiO(OH)0.5 Cl0.5
IMA Status:
Valid Species (Pre-IMA) 1876
Locality:
Constanicia mine, Tazna, Bolivia. Link to MinDat.org Location Data.
Name Origin:
Named for Gabriel Auguste Daubree (1814-1896), French mineralogist and geologist.
Name Pronunciation:
Daubreeite + Pronunciation
Daubreeite Image
Images:
Daubreeite
Comments: Massive yellow daubreeite.
Location: Cerro Tazna, Atocha-Quechisla district, Nor Chichas Province, Potosí Department, Bolivia.
Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag
Daubreeite Crystallography
Axial Ratios:
a:c = 1:1.91968
Cell Dimensions:
a = 3.86, c = 7.41, Z = 2; V = 110.41 Den(Calc)= 7.56
Crystal System:
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm
Physical Properties of Daubreeite
Cleavage:
{001} Perfect
Color:
Yellow, Yellow brown, Cream white.
Density:
6.5
Diaphaneity:
Transparent to Translucent
Fracture:
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Habit:
Compact - Occurs as a compact mass.
Habit:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Habit:
Massive - Fibrous - Distinctly fibrous fine-grained forms.
Hardness:
2-2.5 - Gypsum-Finger Nail
Luster:
Earthy (Dull)
Optical Properties of Daubreeite
Gladstone-Dale:
CI meas = 0.069 (Fair) - where the CI = (1-KPDmeas /KC ) CI calc = 0.2 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1362,KPDmeas = 0.1585,KC = 0.1703 Ncalc = 2.11 - 2.29
Optical Data:
Uniaxial (-), e=1.91, w=2.15, bire=0.2400.
Calculated Properties of Daubreeite
Electron Density:
Bulk Density (Electron Density)=5.38 gm/cc note: Specific Gravity of Daubreeite =6.50 gm/cc.
Fermion Index:
Fermion Index = 0.0000469892 Boson Index = 0.9999530108
Photoelectric:
PEDaubreeite =1,617.44 barns/electronU=PEDaubreeite x r Electron Density=8,704.97 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Daubreeite is Not Radioactive
Daubreeite Classification
Dana Class:
10.02.01.03 (10) Oxyhalides and Hydroxyhalides
(10.02) where A (O,OH) Xq
(10.02.01) Bismoclite Group
10.02.01.01 Zavaritskite BiOF P 4/nmm 4/m 2/m 2/m
10.02.01.02 Bismoclite BiOCl P 4/nmm 4/m 2/m 2/m
10.02.01.03 Daubreeite BiO(OH,Cl) P 4/nmm 4/m 2/m 2/m
Strunz Class:
03.DC.25 03 - HALIDES
03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
03.DC -With Pb (As,Sb,Bi), without Cu
03.DC.25 Bismoclite BiOCl P 4/nmm 4/m 2/m 2/m
03.DC.25 Daubreeite BiO(OH,Cl) P 4/nmm 4/m 2/m 2/m
03.DC.25 Matlockite PbFCl P 4/nmm 4/m 2/m 2/m
03.DC.25 Rorisite (Ca,Mg)FCl P 4/nmm 4/m 2/m 2/m
03.DC.25 Zavaritskite BiOF P 4/nmm 4/m 2/m 2/m
03.DC.25 Zhangpeishanite ! BaFCl P 4/mmm 4mm
Other Daubreeite Information
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Daubreeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Daubreeite
BiO(OH,Cl)
Dana No: 10.02.01.03 Strunz No: 03.DC.25
Locality:
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