Daubreeite Mineral Data

General Daubreeite Information

Chemical Formula:

BiO(OH,Cl)

Composition:

Molecular Weight = 251.21 gm

Bismuth 83.19 % Bi 92.74 % Bi₂O₃

Hydrogen 0.20 % H 1.79 % H₂O

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)_0.5Cl_0.5

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, PotosÃ 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 DipyramidalH-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:

PE_Daubreeite=1,617.44 barns/electron
U=PE_Daubreeite x rElectron 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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Ask about Daubreeite here :
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Print or Cut-and-Paste your Daubreeite Specimen Label here :

Daubreeite

BiO(OH,Cl)
Dana No: 10.02.01.03 Strunz No: 03.DC.25
Locality:

Notes: