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Trechmannite

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Formula:
AgAsS2
Colour:
Deep vermilion-red
Lustre:
Adamantine
Hardness:
1½ - 2
Crystal System:
Trigonal
Name:
Named after Charles Otto Trechmann (1851-1917), English crystallographer.
Dimorph of:
This page provides mineralogical data about Trechmannite.


Classification of Trechmannite

Approved, 'Grandfathered' (first described prior to 1959)
2.GC.35

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
3.7.2.1

3 : SULFOSALTS
7 : ø = 2
5.2.2

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag

Physical Properties of Trechmannite

Adamantine
Transparency:
Transparent, Translucent
Colour:
Deep vermilion-red
Streak:
scarlet red
Hardness:
1½ - 2 on Mohs scale
Fracture:
Conchoidal

Optical Data of Trechmannite

Type:
Uniaxial (-)
RI values:
nω = 2.600 nε = 2.400
Max Birefringence:
δ = 0.200
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Bireflectance:
Extreme
Pleochroism:
Weak
Comments:
Faint with O = pale reddish, E = clear and nearly colorless

Chemical Properties of Trechmannite

Formula:
AgAsS2

Crystallography of Trechmannite

Crystal System:
Trigonal
Cell Parameters:
a = 13.98 Å, c = 9.12 Å
Ratio:
a:c = 1 : 0.652
Unit Cell V:
1,543.62 ų (Calculated from Unit Cell)
Morphology:
Short prismatic, equant. Sometimes irregular.

Type Occurrence of Trechmannite

Synonyms of Trechmannite

Other Language Names for Trechmannite

Common Associates

Associated Minerals Based on Photo Data:
Dolomite2 photos of Trechmannite associated with Dolomite on mindat.org.
Wallisite2 photos of Trechmannite associated with Wallisite on mindat.org.
Hatchite2 photos of Trechmannite associated with Hatchite on mindat.org.
Pyrite1 photo of Trechmannite associated with Pyrite on mindat.org.
Baumhauerite1 photo of Trechmannite associated with Baumhauerite on mindat.org.
Pararealgar1 photo of Trechmannite associated with Pararealgar on mindat.org.
Tennantite1 photo of Trechmannite associated with Tennantite on mindat.org.
Realgar1 photo of Trechmannite associated with Realgar on mindat.org.

Related Minerals - Nickel-Strunz Grouping

2.GC.05HatchiteAgTlPbAs2S5
2.GC.05Wallisite(Cu,Ag)TlPbAs2S5
2.GC.10SinneriteCu6As4S9
2.GC.15WatanabeiteCu4(As,Sb)2S5
2.GC.20SimoniteTlHgAs3S6
2.GC.25QuadratiteAg(Cd,Pb)AsS3
2.GC.25ManganoquadratiteAgMnAsS3
2.GC.30SmithiteAgAsS2
2.GC.40aAleksitePbBi2Te2S2
2.GC.40bKochkaritePbBi4Te7
2.GC.40cPoubaitePbBi2(Se,Te,S)4
2.GC.40cRucklidgeitePbBi2Te4
2.GC.40eBabkinitePb2Bi2(S,Se)3
2.GC.40dSaddlebackitePb2Bi2Te2S3
2.GC.45TvalchrelidzeiteHg3SbAsS3
2.GC.50MutnovskitePb4As2S6ICl

Related Minerals - Hey's Chemical Index of Minerals Grouping

5.2.1SmithiteAgAsS2
5.2.3ProustiteAg3AsS3
5.2.4XanthoconiteAg3AsS3
5.2.5Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
5.2.6Pearceite-T2ac
5.2.7ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13
5.2.8MiargyriteAgSbS2
5.2.9PyrargyriteAg3SbS3
5.2.10PyrostilpniteAg3SbS3
5.2.11StephaniteAg5SbS4
5.2.12Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
5.2.13BillingsleyiteAg7AsS6
5.2.14Polybasite-Tac
5.2.15FreibergiteAg6[Cu4Fe2]Sb4S13-x
5.2.16AramayoiteAg3Sb2(Bi,Sb)S6
5.2.17MatilditeAgBiS2
5.2.18SchapbachiteAg0.4Pb0.2Bi0.4S
5.2.19PavoniteAgBi3S5
5.2.20ArcubisiteAg6CuBiS4
5.2.21BohdanowicziteAgBiSe2
5.2.22SelenostephaniteAg5Sb(Se,S)4
5.2.23Benleonardite[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]
5.2.24VolynskiteAgBiTe2

Other Information

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 Trechmannite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Magazine (1905): 14: 72-82.
Solly (1907) Mineralogical Magazine: 14: 283.
Smith and Prior (1907), Mineralogical Magazine: 14: 283, p. 300 (?)
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 432.
American Mineralogist (1968): 53: 1208-1214.
Zeitschrift für Kristallographie (1969): 129: 163-177.

Internet Links for Trechmannite

mindat.org URL:
https://www.mindat.org/min-4009.html
Please feel free to link to this page.

Localities for Trechmannite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Victoria
    • Campaspe Shire
      • Cornella
A. R. Seymon, 2006, Nickel Propectivity in Victoria, Geological Survey of Victoria Technical Record 2006/3
Germany
 
  • Hesse
    • Odenwald
      • Mühltal
        • Nieder-Beerbach
From the Wilke collection.
Iran
 
  • West Azarbaijan Province (West Azerbaijan Province)
    • Sardasht County
      • Sardasht
Topa, D., Makovicky, E., Tajedin, H., Putz, H., Zagler, G. (2013): Barikaite, Pb10Ag3(Sb8As11)S19S40, a new member of the sartorite homologous series. Mineralogical Magazine, 77, 3039-3046.
Switzerland
 
  • Wallis (Valais)
    • Binn Valley
      • Binn
Cannon, R., Hensel, H. & Raber, T. (2008): Der Reckibach-Dolomit im Binntal, Schweiz: Mineralbestand und Neufunde. Lapis, 33 (3), 20-28; 50. (in German)
      • Fäld (Imfeld; Im Feld; Feld)
Mineralogical Magazine(1905) 14, 72-82 (p. 75)
Mineral and/or Locality  
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