Dadsonite Mineral Data

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General Dadsonite Information

Chemical Formula:

Pb21Sb23S55Cl

Composition:

Molecular Weight = 8,950.53 gm

Antimony 31.29 % Sb

Lead 48.61 % Pb

Sulfur 19.70 % S

Chlorine 0.40 % Cl

______

100.00 %

Empirical Formula:

Pb₂₁Sb₂₃S₅₅Cl

Environment:

In hydrothermal veins with other sulfides and lead sulfosalt minerals.

IMA Status:

Approved IMA 1969

Locality:

Giant property, Yellowknife, NWT, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Alexander S. Dadson (1906-1958), Canadian mineralogist.

Name Pronunciation:

Dadsonite + Pronunciation

Synonym:

IMA1968-011

Dadsonite Image

Images:

Dadsonite

Comments: Gay metallic massive dadsonite.
Location: Wolfsberg, Harzgerode, Sachsen-Anhalt, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dadsonite Crystallography

Axial Ratios:

a:b:c =4.635:1:4.2165

Cell Dimensions:

a = 19.05, b = 4.11, c = 17.33, Z = 0.5; beta = 96.333° V = 1,348.58 Den(Calc)= 5.51

Crystal System:

MonoclinicSpace Group: P 2,Pm,P 2/m

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

By Intensity(I/I_o): 3.38(1), 2.84(0.7), 3.78(0.7),

Crystal Structure:

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Makovicky E , Topa D , Mumme W G , The Canadian Mineralogist , 44 (2006) p.1499-1512, The crystal structure of dadsonite, Locality: Low Tatra Mountains, Slovakia, Sample: 4-angstrom structure

Physical Properties of Dadsonite

Color:

Lead gray, Gray.

Density:

5.68 - 5.76, Average = 5.72

Diaphaneity:

Opaque

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Streak:

black

Optical Properties of Dadsonite

RL Anisotrophism:

Distinct to strong, in greenish gray.

RL Color:

White with a greenish tint, with blood-red internal reflections in oil.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Dadsonite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	44.00	46.60
420 nm	42.30	45.80
440 nm	40.80	45.10
460 nm	39.60	44.50
480 nm	39.20	44.10
500 nm	39.10	44.00
520 nm	39.10	44.00
540 nm	39.10	43.90
560 nm	38.90	43.00
580 nm	38.40	42.00
600 nm	37.90	41.30
620 nm	37.30	40.60
640 nm	36.80	39.90
660 nm	36.20	39.10
680 nm	35.70	38.10
700 nm	35.30	37.10

**Calculated Relative Intensity Colors of Dadsonite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%
R₁
R₂

Calculated Properties of Dadsonite

Electron Density:

Bulk Density (Electron Density)=4.67 gm/cc
note: Specific Gravity of Dadsonite =5.51 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Dadsonite= 990.55 barns/electron
U=PE_Dadsonite x rElectron Density=4,624.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dadsonite is Not Radioactive

Dadsonite Classification

Dana Class:

03.06.08.01 (03)Sulfides - Sulfosalts

(03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.06.08)Dana Group

03.06.08.01 Dadsonite Pb21Sb23S55Cl P 2,Pm,P 2/m Mono

Strunz Class:

02.HC.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HC -With only Pb

02.HC.30 Dadsonite Pb21Sb23S55Cl P 2,Pm,P 2/m Mono

Other Dadsonite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Dadsonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Dadsonite Specimen Label here :

Dadsonite

Pb21Sb23S55Cl
Dana No: 03.06.08.01 Strunz No: 02.HC.30
Locality:

Notes: