Lead Mineral Data

Lead Mineral Data +

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General Lead Information

Chemical Formula:

Composition:

Molecular Weight = 207.20 gm

Lead 100.00 % Pb

______

100.00 %

Empirical Formula:

Environment:

Rare mineral of hydrothermal origin, and found in placers; possibly also formed by authigenic processes and known to replace tree roots.

IMA Status:

Valid Species (Pre-IMA) Prehistoric

Locality:

Langban, Sweden. Link to MinDat.org Location Data.

Name Origin:

Anglo-Saxon, lead; Latin plumbum.

Synonym:

ICSD 64808

PDF 4-686

Plumbum

Lead Image

Images:

Lead

Comments: Native lead sheet partially covering an actinolite schist.
Location: Garpenberg Norra, Hedemorra, Sweden. Scale: 7.5 x 4.5 cm.
© John Veevaert

Images:

Lead

Comments: Irregular mass of native lead from a lead-zinc-silver ore deposit.
Location: Broken Hill, NSW, Australia. Scale: 8 cm across.
© Dave Barthelmy

Lead Crystallography

Cell Dimensions:

a = 4.9505, Z = 4; V = 121.32 Den(Calc)= 11.34

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 2.855(1), 2.475(0.5), 1.493(0.32),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Wyckoff R W G , Crystal Structures , 1 (1963) p.7-83, Second edition. Interscience Publishers, New York, New York, Cubic closest packed, ccp, structure

Physical Properties of Lead

Cleavage:

None

Color:

Lead gray, Gray white.

Density:

11.37

Diaphaniety:

Opaque

Fracture:

Malleable - Deforms rather than breaking apart with a hammer.

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Hardness:

2-2.5 - Gypsum-Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

lead gray

Optical Properties of Lead

RL Color:

Gray-white with a brownish tint and brownish red internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Lead in Air**
λ	R	∑ R(λ)
400 nm	45.60
420 nm	45.90
440 nm	46.20
460 nm	46.50
480 nm	46.90
500 nm	47.40
520 nm	48.10
540 nm	48.90
560 nm	49.70
580 nm	50.40
600 nm	51.00
620 nm	51.70
640 nm	52.50
660 nm	53.60
680 nm	55.20
700 nm	57.90

**Calculated Relative Intensity Colors of Lead in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R

Calculated Properties of Lead

Electron Density:

r_electron=8.98 gm/cc
note: r_Lead=11.3 gm/cc.

Fermion Index

Fermion Index = 0.221
Boson Index = 0.779

Photoelectric:

PE_Lead=1,939.41 barns/electron
U=PE_Lead x r_electron=17407.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lead is Not Radioactive

Lead Classification

Dana Class:

1.1.1.4 (1)Native Elements

(1.1)with metallic elements other than the platinum group

(1.1.1)Gold group

1.1.1.1 Gold Au F m3m 4/m 3 2/m

1.1.1.2 Silver Ag F m3m 4/m 3 2/m

1.1.1.3 Copper Cu F m3m 4/m 3 2/m

1.1.1.4 Lead Pb F m3m 4/m 3 2/m

1.1.1.5 Aluminum Al F m3m,P m3m 4/m 3 2/m

Strunz Class:

I/A.05-20 I - Elements

I/A - Metallic and intermetallic compounds, Carbides, Nitrides, Phosphides and Silicides

I/A.05 - Lead series

I/A.05-10 Indium In I 4/mmm 4/m 2/m 2/m

I/A.05-20 Lead Pb F m3m 4/m 3 2/m

I/A.05-30 Tin Sn I 4₁/amd 4/m 2/m 2/m

Other Lead Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Lead

Pb
Dana No: 1.1.1.4 Strunz No: I/A.05-20
Locality:

Notes: