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Trechmannite

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Formula:
AgAsS2
System:
Trigonal
Colour:
Deep vermilion-red
Lustre:
Adamantine
Hardness:
1½ - 2
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
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Deep vermilion-red
Streak:
scarlet red
Hardness (Mohs):
1½ - 2
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
Elements listed in formula:

Crystallography of Trechmannite

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

Type Occurrence of Trechmannite

Relationship of Trechmannite to other Species

2.GC.05HatchiteAgPbTlAs2S5
2.GC.05WallisiteCuPbTlAs2S5
2.GC.10SinneriteCu6As4S9
2.GC.15WatanabeiteCu4As2S5
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.50MutnovskitePb2AsS3I
5.2.1SmithiteAgAsS2
5.2.3ProustiteAg3AsS3
5.2.4XanthoconiteAg3AsS3
5.2.5Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
5.2.6Pearceite-T2ac
5.2.7ArgentotennantiteAg6Cu4(Fe,Zn)2As4S13
5.2.8MiargyriteAgSbS2
5.2.9PyrargyriteAg3SbS3
5.2.10PyrostilpniteAg3SbS3
5.2.11StephaniteAg5SbS4
5.2.12PolybasiteCu(Ag,Cu)6Ag9Sb2S11
5.2.13BillingsleyiteAg7AsS6
5.2.14Polybasite-Tac
5.2.15FreibergiteAg6Cu4Fe2Sb4S13-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
5.2.23BenleonarditeAg15Cu(Sb,As)2S7Te4
5.2.24VolynskiteAgBiTe2

Other Names for Trechmannite

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:
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.
Specimens:
The following Trechmannite specimens are currently listed for sale on minfind.com.

Localities for Trechmannite

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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