Drysdallite Mineral Data

Drysdallite Mineral Data +

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General Drysdallite Information

Chemical Formula:

Mo(Se,S)2

Composition:

Molecular Weight = 230.41 gm

Molybdenum 41.64 % Mo

Selenium 51.40 % Se

Sulfur 6.96 % S

______

100.00 %

Empirical Formula:

MoSe_1.5S_0.5

Environment:

In the oxidation zone of a uranium deposit in a talc schist.

IMA Status:

Approved IMA 1973

Locality:

From the Kapijimpanga uranium deposit, 16 km southeast of Solwezi, Northwestern Province, Zambia. Link to MinDat.org Location Data.

Name Origin:

For A.R. Drysdall, Director, Geological Survey of Zambia.

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Drysdallite Crystallography

Axial Ratios:

a:c = 1:3.92544

Cell Dimensions:

a = 3.286, c = 12.899, Z = 2; V = 120.62 Den(Calc)= 6.34

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 2.373(1), 6.46(0.76), 2.845(0.55),

Physical Properties of Drysdallite

Cleavage:

[0001] Perfect

Color:

Grayish black.

Density:

6.25

Diaphaniety:

Opaque

Hardness:

1-1.5 - Talc or a little harder

Luster:

Metallic

Streak:

brown black

Optical Properties of Drysdallite

RL Anisotrophism:

Very strong, with colors from light bluish gray to purplish brown.

RL Color:

Grayish black with a yellowish tint.

RL Pleochroism:

Strong, white to very light gray, to pinkish gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Drysdallite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	17.00	38.00
420 nm	18.20	37.80
440 nm	19.40	37.60
460 nm	20.40	37.60
480 nm	21.40	37.50
500 nm	21.80	37.50
520 nm	21.80	37.40
540 nm	21.60	37.10
560 nm	21.40	36.70
580 nm	21.10	36.00
600 nm	20.80	35.50
620 nm	20.60	35.10
640 nm	20.50	35.00
660 nm	20.40	35.00
680 nm	20.40	35.20
700 nm	20.40	35.60

**Calculated Relative Intensity Colors of Drysdallite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%
R₁
R₂

Calculated Properties of Drysdallite

Electron Density:

r_electron=5.56 gm/cc
note: r_Drysdallite=6.34 gm/cc.

Fermion Index

Fermion Index = 0.14564
Boson Index = 0.85436

Photoelectric:

PE_Drysdallite= 114.13 barns/electron
U=PE_Drysdallite x r_electron= 634.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Drysdallite is Not Radioactive

Drysdallite Classification

Dana Class:

2.12.10.2 (2)Sulfides - Including Selenides and Tellurides

(2.12)where Am Bn Xp, with (m+n):p=1:2

(2.12.10)Dana Group

2.12.10.1 Molybdenite MoS2 P 6₃/mmc 6/m 2/m 2/m

2.12.10.2 Drysdallite Mo(Se,S)2 P 6₃/mmc 6/m 2/m 2/m

2.12.10.3 Tungstenite WS2 P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

II/D.25-30 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.25 - Molybdenite series

II/D.25-05 IMA1999-004a! ReS2 P1 1

II/D.25-10 Molybdenite MoS2 P 6₃/mmc 6/m 2/m 2/m

II/D.25-20 Jordisite MoS2 None

II/D.25-30 Drysdallite Mo(Se,S)2 P 6₃/mmc 6/m 2/m 2/m

II/D.25-40 Tungstenite WS2 P 6₃/mmc 6/m 2/m 2/m

Other Drysdallite Information

References:

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

See Also:

Links to other databases for Drysdallite :
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

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

Drysdallite

Mo(Se,S)2
Dana No: 2.12.10.2 Strunz No: II/D.25-30
Locality:

Notes: