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Damaraite Mineral Data
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General Damaraite Information
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 Chemical Formula: |
Pb3O2(OH)Cl |
| Composition: |
Molecular Weight = 706.06 gm |
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Hydrogen 0.14 % H 1.28 % H2O |
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Lead 88.04 % Pb 94.84 % PbO |
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Chlorine 5.02 % Cl 5.02 % Cl |
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- %
Cl -1.13 % -O=Cl2 |
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Oxygen 6.80 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Pb3O2(OH)Cl |
| Environment: |
Oxidized zone. |
| IMA Status: |
Approved IMA 1990 |
| Locality: |
Kombat mine, 49 km S of Tsumeb, Namibia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the Damara sequence, the dolostones that host the deposit at the type locality. |
| Name Pronunciation: |
Damaraite + Pronunciation  |
| Synonym: |
IMA1989-013 |
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Damaraite Crystallography
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| Axial Ratios: |
a:b:c =0.8399:1:2.195 |
| Cell Dimensions: |
a = 5.813, b = 6.921, c = 15.192, Z = 4; V = 611.20 Den(Calc)= 7.67 |
| Crystal System: |
Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Pmc2 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.766(1), 2.902(1), 3.164(0.6), |
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Physical Properties of Damaraite
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| Cleavage: |
{010} Good |
| Color: |
Colorless. |
| Diaphaneity: |
Transparent |
| Fracture: |
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. |
| Habit: |
Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape. |
| Hardness: |
3 - Calcite |
| Luster: |
Adamantine |
| Streak: |
white |
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Optical Properties of Damaraite
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| Optical Data: |
NCalc= 2.12 - from Gladstone-Dale relationship (KC = 0.1463) where Ncalc=Dcalc*KC+1
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| RL Anisotrophism: |
Weak. |
| RL Bireflectance: |
Weak. |
| RL Color: |
Gray with white to colorless internal reflections. |
| RL Pleochroism: |
Very weak, gray to slightly bluish gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Damaraite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
19.10 |
20.80 |
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| 420 nm |
18.60 |
23.10 |
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| 440 nm |
17.90 |
21.10 |
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| 460 nm |
17.40 |
19.40 |
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| 480 nm |
16.90 |
18.50 |
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| 500 nm |
16.60 |
17.90 |
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| 520 nm |
16.20 |
17.40 |
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| 540 nm |
16.00 |
17.00 |
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| 560 nm |
15.80 |
16.70 |
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| 580 nm |
15.60 |
16.50 |
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| 600 nm |
15.50 |
16.30 |
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| 620 nm |
15.40 |
16.20 |
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| 640 nm |
15.20 |
16.00 |
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| 660 nm |
15.20 |
15.90 |
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| 680 nm |
15.10 |
15.80 |
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| 700 nm |
15.00 |
15.60 |
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Calculated Relative Intensity Colors of Damaraite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
540% |
560% |
| R1 |
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| R2 |
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Calculated Properties of Damaraite
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| Electron Density: |
Bulk Density (Electron Density)=6.26 gm/cc
note: Specific Gravity of Damaraite =7.67 gm/cc.
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| Fermion Index: |
Fermion Index = 0.19
Boson Index = 0.81 |
| Photoelectric: |
PEDamaraite =1,657.01 barns/electron
U=PEDamaraite x rElectron Density=10368.20 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Damaraite is Not Radioactive |
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Damaraite Classification
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| Dana Class: |
10.05.10.01 (10)Oxyhalides and Hydroxyhalides |
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(10.05)where Am (O,OH)p Xq |
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(10.05.10)Dana Group |
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10.05.10.01 Damaraite Pb3O2(OH)Cl Pmc2 mm2 |
| Strunz Class: |
03.DC.75 03 - HALIDES |
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03.D - Oxyhalides, Hydroxyhalides and Related Double Halides |
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03.DC -With Pb (As,Sb,Bi), without Cu |
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03.DC.75 Damaraite Pb3O2(OH)Cl Pmc2 mm2 |
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Other Damaraite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.77, p671, Vol 87, p 183) OPTIC PROP.(AntBidBlaNic3) |
| See Also: |
Links to other databases for Damaraite :
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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Print or Cut-and-Paste your Damaraite Specimen Label here :
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Damaraite
Pb3O2(OH)Cl
Dana No: 10.05.10.01 Strunz No: 03.DC.75
Locality:
Notes:
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