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Drysdallite Mineral Data
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General Drysdallite Information
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 Chemical Formula: |
Mo(Se,S)2 |
| Composition: |
Molecular Weight = 230.41 gm |
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Molybdenum 41.64 % Mo |
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Selenium 51.40 % Se |
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Sulfur 6.96 % S |
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______ |
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100.00 % |
| Empirical Formula: |
MoSe1.5S0.5 |
| 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. |
| Name Pronunciation: |
Drysdallite + Pronunciation  |
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Drysdallite Image |
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Images:
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Drysdallite
Comments: Metallic, black, submillimeter crystals of drysdallite approximatly 0.1 mm.
Location: Western Province, Zambia.
Scale: Picthure Size 5 mm.
© Sandro Maggia/Minernet.it |
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Drysdallite Crystallography
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| 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 Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc |
| X Ray Diffraction: |
By Intensity(I/Io): 2.373(1), 6.46(0.76), 2.845(0.55), |
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Physical Properties of Drysdallite
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| Cleavage: |
{0001} Perfect |
| Color: |
Grayish black. |
| Density: |
6.25 |
| Diaphaneity: |
Opaque |
| Hardness: |
1-1.5 - Talc or a little harder |
| Luster: |
Metallic |
| Streak: |
brown black |
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Optical Properties of Drysdallite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
17.00 |
38.00 |
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| 420 nm |
18.20 |
37.80 |
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| 440 nm |
19.40 |
37.60 |
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| 460 nm |
20.40 |
37.60 |
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| 480 nm |
21.40 |
37.50 |
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| 500 nm |
21.80 |
37.50 |
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| 520 nm |
21.80 |
37.40 |
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| 540 nm |
21.60 |
37.10 |
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| 560 nm |
21.40 |
36.70 |
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| 580 nm |
21.10 |
36.00 |
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| 600 nm |
20.80 |
35.50 |
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| 620 nm |
20.60 |
35.10 |
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| 640 nm |
20.50 |
35.00 |
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| 660 nm |
20.40 |
35.00 |
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| 680 nm |
20.40 |
35.20 |
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| 700 nm |
20.40 |
35.60 |
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Calculated Relative Intensity Colors of Drysdallite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
450% |
| R1 |
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| R2 |
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Calculated Properties of Drysdallite
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| Electron Density: |
Bulk Density (Electron Density)=5.56 gm/cc
note: Specific Gravity of Drysdallite =6.34 gm/cc.
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| Fermion Index: |
Fermion Index = 0.14
Boson Index = 0.86 |
| Photoelectric: |
PEDrysdallite = 114.13 barns/electron
U=PEDrysdallite x rElectron Density= 634.35 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Drysdallite is Not Radioactive |
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Drysdallite Classification
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| Dana Class: |
02.12.10.02 (02)Sulfides - Including Selenides and Tellurides |
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(02.12)where Am Bn Xp, with (m+n):p=1:2 |
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(02.12.10)Molybdenite Group |
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02.12.10.01 Molybdenite MoS2 P 63/mmc 6/m 2/m 2/m |
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02.12.10.02 Drysdallite Mo(Se,S)2 P 63/mmc 6/m 2/m 2/m |
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02.12.10.03 Tungstenite WS2 P 63/mmc 6/m 2/m 2/m |
| Strunz Class: |
02.EA.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.E - Metal Sulfides, M:S � 1:2 |
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02.EA -M:S = 1:2 |
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02.EA.30 Drysdallite Mo(Se,S)2 P 63/mmc 6/m 2/m 2/m |
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02.EA.30 Jordisite MoS2 None |
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02.EA.30 Molybdenite MoS2 P 63/mmc 6/m 2/m 2/m |
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02.EA.30 Tungstenite WS2 P 63/mmc 6/m 2/m 2/m |
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Other Drysdallite Information
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| 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Drysdallite
Mo(Se,S)2
Dana No: 02.12.10.02 Strunz No: 02.EA.30
Locality:
Notes:
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