Damaraite Mineral Data

Damaraite Mineral Data +

General Damaraite Information

Chemical Formula:

Pb3O2(OH)Cl

Composition:

Molecular Weight = 706.06 gm

Hydrogen 0.14 % H 1.28 % H₂O

Lead 88.04 % Pb 94.84 % PbO

Chlorine 5.02 % Cl 5.02 % Cl

- % Cl -1.13 % -O=Cl₂

Oxygen 6.80 % O

______ ______

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.

Synonym:

IMA1989-013

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Damaraite Crystallography

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 - PyramidalH-M Symbol (mm2) Space Group: Pmc2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.766(1), 2.902(1), 3.164(0.6),

Crystal Structure:

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Krivovichev S V , Burns P C , European Journal of Mineralogy , 13 (2001) p.801-809, Crystal chemistry of lead oxide chlorides. I. Crystal structures of, synthetic mendipite, Pb3O2Cl2, and synthetic damaraite, Pb3O2(OH)Cl

View Additional jPOWD Structure files for Damaraite
[1]

Physical Properties of Damaraite

Cleavage:

[010] Good

Color:

Colorless.

Diaphaniety:

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

Optical Properties of Damaraite

Optical Data:

NCalc= 2.12 - from Gladstone-Dale relationship (KC = 0.1463) where Ncalc=Dcalc*KC+1

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	∑ R₁(λ)	∑ R₂(λ)
400 nm	19.10	20.80
420 nm	18.60	23.10
440 nm	17.90	21.10
460 nm	17.40	19.40
480 nm	16.90	18.50
500 nm	16.60	17.90
520 nm	16.20	17.40
540 nm	16.00	17.00
560 nm	15.80	16.70
580 nm	15.60	16.50
600 nm	15.50	16.30
620 nm	15.40	16.20
640 nm	15.20	16.00
660 nm	15.20	15.90
680 nm	15.10	15.80
700 nm	15.00	15.60

**Calculated Relative Intensity Colors of Damaraite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	560%
R₁
R₂

Calculated Properties of Damaraite

Electron Density:

r_electron=6.26 gm/cc
note: r_Damaraite=7.67 gm/cc.

Fermion Index

Fermion Index = 0.19459
Boson Index = 0.80541

Photoelectric:

PE_Damaraite=1,657.01 barns/electron
U=PE_Damaraite x r_electron=10368.20 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Damaraite is Not Radioactive

Damaraite Classification

Dana Class:

10.5.10.1 (10)Oxyhalides and Hydroxyhalides

(10.5)where Am (O,OH)p Xq

(10.5.10)Dana Group

10.5.10.1 Damaraite Pb3O2(OH)Cl Pmc2 mm2

Strunz Class:

III/D.11-15 III - Halogenides

III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds

III/D.11 - Mendipite - Onoratoite series

III/D.11-10 Mendipite Pb3Cl2O2 P 2₁2₁2₁ 2 2 2

III/D.11-15 Damaraite Pb3O2(OH)Cl Pmc2 mm2

III/D.11-17 Chubutite* Pb7O6Cl2 Unk Ortho

III/D.11-20 Penfieldite Pb2Cl3(OH) P 6/mmm 6/m 2/m 2/m

III/D.11-30 Blixite Pb2Cl(O,OH)2 Unk Ortho

III/D.11-35 Mereheadite! Pb2O(OH)Cl C 2/c 2/m

III/D.11-40 Sundiusite Pb10(SO4)Cl2O8 C 2,Cm,C 2/m Mono

III/D.11-50 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m

III/D.11-55 Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 2/m 2/m

III/D.11-60 Thorikosite Pb3(Sb,As)O3(OH)Cl2 I 4/mmm 4/m 2/m 2/m

III/D.11-65 Philolithite! Pb12O6Mn(Mg,Mn)2(Mn,Mg)4(SO4)(CO3)4Cl4(OH)12 P 4₁/nnm 4/m 2/m 2/m

III/D.11-70 Pinalite Pb3(WO4)OCl2 Amam 2/m 2/m 2/m

III/D.11-80 Nadorite PbSbO2Cl Bmmb 2/m 2/m 2/m

III/D.11-90 Perite PbBiO2Cl Bmmb 2/m 2/m 2/m

III/D.11-100 Heliophyllite Pb6As2O7Cl4 Unk Ortho

III/D.11-110 Ecdemite Pb6As2O7Cl4 Unk Tetra

III/D.11-120 Onoratoite Sb8O11Cl2 C 2/m 2/m

Other Damaraite Information

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Damaraite

Pb3O2(OH)Cl
Dana No: 10.5.10.1 Strunz No: III/D.11-15
Locality:

Notes: