Dadsonite Mineral Data

Dadsonite Mineral Data +

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.

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),

Physical Properties of Dadsonite

Color:

Lead gray, Gray.

Density:

5.68 - 5.76, Average = 5.72

Diaphaniety:

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:

r_electron=4.67 gm/cc
note: r_Dadsonite=5.51 gm/cc.

Fermion Index

Fermion Index = 0.10891
Boson Index = 0.89109

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Dadsonite is Not Radioactive

Dadsonite Classification

Dana Class:

3.6.8.1 (3)Sulfides - Sulfosalts

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

(3.6.8)Dana Group

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

Strunz Class:

II/E.20-60 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x), Sulfosalts with predominant Iron and Copper x = 2.0

II/E.20 - Madocite - Dadsonite series

II/E.20-10 Madocite Pb17(Sb,As)16S41 Pb2a mm2

II/E.20-20 Launayite Pb22Sb26S61 C 2/m 2/m

II/E.20-25 Pellouxite! (Cu,Ag)Pb10Sb12S27(Cl,S)0.6O C 2/m 2/m

II/E.20-30 Sterryite Ag2Pb10(Sb,As)12S29 Pbam 2/m 2/m 2/m

II/E.20-40 Playfairite Pb16Sb18S43 P 2₁/m 2/m

II/E.20-50 Sorbyite Pb19(Sb,As)20S49 C 2/m 2/m

II/E.20-60 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 -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 - WWW-MINCRYST 13 -École des Mines de Paris

Search for Dadsonite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Dadsonite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Dadsonite Mineral Data :

Ask about Dadsonite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Dadsonite

Pb21Sb23S55Cl
Dana No: 3.6.8.1 Strunz No: II/E.20-60
Locality:

Notes: