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Drysdallite

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About DrysdalliteHide

Formula:
Mo(Se,S)2
Colour:
Grayish black with a brown tint
Lustre:
Metallic
Hardness:
2
Specific Gravity:
6.248 (Calculated)
Crystal System:
Hexagonal
Name:
Named in honor of Alan Roy Drysdall (23 May 1933, Southampton, England - 11 January 2017, Southampton, England) geologist and Director of the Geological Survey of Zambia. The cynodont Luangwa drysdalli is also named for him.
Se-analogue of molybdenite.


Classification of DrysdalliteHide

Approved
First Published:
1973
2.EA.30

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
A : M:S = 1:2 - With Cu, Ag, Au
2.12.10.2

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.8.9

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
8 : Sulphides etc. of Cr, Mo, W an Mn

Pronounciation of DrysdalliteHide

Pronounciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of DrysdalliteHide

Metallic
Transparency:
Opaque
Colour:
Grayish black with a brown tint
Streak:
Brownish black
Hardness:
Hardness:
VHN7=46 - 58 kg/mm2 - Vickers
Tenacity:
Waxy
Cleavage:
Perfect
on {0001}
Comment:
Pliable, difficult to pulverise
Density:
6.248 g/cm3 (Calculated)

Optical Data of DrysdalliteHide

Type:
Anisotropic
Anisotropism:
Very strong, light bluish gray to purplish brown
Pleochroism:
Strong
Comments:
White to very light gray, to pinkish gray

Chemical Properties of DrysdalliteHide

Formula:
Mo(Se,S)2
IMA Formula:
MoSe2

Crystallography of DrysdalliteHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Setting:
P63/mmc
Cell Parameters:
a = 3.287(1) Å, c = 12.925(2) Å
Ratio:
a:c = 1 : 3.932
Unit Cell V:
120.94 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Steep pyramidal crystals, massive
Comment:
Space group from synthetic material

Type Occurrence of DrysdalliteHide

Place of Conservation of Type Material:
Smithsonian
Geological Setting of Type Material:
Oxidation zone of uranium deposit
Associated Minerals at Type Locality:
Reference:
Cech, F., Rieder, M., Vrána, S. (1973) Drysdallite, MoSe2, a new mineral. Neues Jahrbuch für Mineralogie, Monatshefte: 1973: 433-442.

Synonyms of DrysdalliteHide

Other Language Names for DrysdalliteHide

Relationship of Drysdallite to other SpeciesHide

Other Members of this group:
MolybdeniteMoS2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
TungsteniteWS2Trig. 3m : R3m

Related Minerals - Nickel-Strunz GroupingHide

2.EA.05Sylvanite(Au,Ag)2Te4Mon. 2/m : P2/b
2.EA.10CalaveriteAuTe2Mon.
2.EA.15KostoviteCuAuTe4Orth.
2.EA.15KrenneriteAu3AgTe8Orth. mm2 : Pma2
2.EA.20BerndtiteSnS2Trig. 3m (3 2/m) : P3m1
2.EA.20KitkaiteNiTeSeTrig.
2.EA.20MeloniteNiTe2Trig.
2.EA.20Merenskyite(Pd,Pt)(Te,Bi)2Trig. 3m : P3m1
2.EA.20Moncheite(Pt,Pd)(Te,Bi)2Trig.
2.EA.20ShuangfengiteIrTe2Trig.
2.EA.20SudovikovitePtSe2Trig.
2.EA.25VerbeekitePdSe2Mon.
2.EA.30JordisiteMoS2
2.EA.30MolybdeniteMoS2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.EA.30TungsteniteWS2Trig. 3m : R3m

Related Minerals - Dana Grouping (8th Ed.)Hide

2.12.10.1MolybdeniteMoS2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.12.10.3TungsteniteWS2Trig. 3m : R3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.8.1BrezinaiteCr3S4Mon. 2/m
3.8.2CaswellsilveriteNaCrS2Trig. 3m (3 2/m) : R3m
3.8.3KalininiteZnCr2S4
3.8.4DaubréeliteFe2+Cr3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
3.8.5Heideite(Fe,Cr)1.15(Ti,Fe)2S4Mon. 2/m
3.8.6MolybdeniteMoS2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.8.7 Molybdenite-3RMoS2Trig. 3m : R3m
3.8.8JordisiteMoS2
3.8.10TungsteniteWS2Trig. 3m : R3m
3.8.12AlabanditeMnSIso. m3m (4/m 3 2/m) : Fm3m
3.8.13HaueriteMnS2Iso. m3 (2/m 3) : Pa3
3.8.14Manganoshadlunite(Mn,Pb,Cd)(Cu,Fe)8S8

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for DrysdalliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cech, F., Rieder, M., Vrána, S. (1973) Drysdallite, MoSe2, a new mineral. Neues Jahrbuch für Mineralogie, Monatshefte: 1973: 433-442.
Fleischer, M. (1974) New mineral names. American Mineralogist: 59: 1139-1141.

Internet Links for DrysdalliteHide

Localities for DrysdalliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China
 
  • Hubei Province
    • Enshi Autonomous Prefecture (E'xi Autonomous Prefecture)
      • Enshi Co.
Linbo Yao, Zhenmin Gao, Zhusen Yang, Hongbo Long, Xianxian Ye, and Mingzai Wang (2001): Acta Mineralogica Sinica 21(1), 49-52
Zambia (TL)
 
  • North-Western Province
    • Solwezi District
American Mineralogist: 59: 1139
Mineral and/or Locality  
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