Trechmannite Mineral Data

Trechmannite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About

Advertisment
Your premier supplier of quality mineral specimens from Southern Africa and the world at large
 Adamsminerals.com- Online mineral store front for mineral collectors
 For more than thirty (30) years, Excalibur Mineral Corp. has been providing private collectors, researchers, major universities and museums throughout the world with reliably identified, rare and unusual mineral samples for science an
 McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs

General Trechmannite Information

Help on Chemical Formula: Chemical Formula: AgAsS2
Help on Composition: Composition: Molecular Weight = 246.92 gm
   Silver   43.69 %  Ag
   Arsenic  30.34 %  As
   Sulfur   25.97 %  S
           ______ 
           100.00 % 
Help on Empirical Formula: Empirical Formula: AgAsS2
Help on Environment: Environment: Of hydrothermal origin, in dolomite. Dimorphous with smithite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1905
Help on Locality: Locality: Lengenbach, Binnental, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Charles O. Trechmenn (1851-1917), English mineralogist.
Help on Name Pronunciation: Name Pronunciation: Trechmannite + Pronunciation Say TRECHMANNITE
Help on Synonym: Synonym: ICSD 18101
  PDF 42-555
 

Trechmannite Image

Click Here for Larger Trechmannite Image in a New Browser Window Images:
Click Here for Larger Trechmannite Image

Trechmannite

Comments: Dark red, trigonal pyramid crystal of trechmannite on dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals
Click Here for Larger Trechmannite Image in a New Browser Window Images:
Click Here for Larger Trechmannite Image

Trechmannite

Comments: Red prismatic crystals of trechmannite with minor gray glossy sulfosalt (rathite?) on white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal size 0.3 mm.
© Walter Gabriel
Click Here for Larger Trechmannite Image in a New Browser Window Images:
Click Here for Larger Trechmannite Image

Trechmannite

Comments: Colorfull assemblege of techmannite (reddish black) with orpiment (golden yellow) and realgar (reddish orange) in white dolomite.
Location: Lengenbach quarry, Binntal, Wallis, Switzerland. Scale: Picture size 3 mm.
© Tom Loomis / Dakota Matrix

Trechmannite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.65236
Help on Cell Dimensions: Cell Dimensions: a = 13.98, c = 9.12, Z = 18; V = 1,543.62 Den(Calc)= 4.78
Help on Crystal System: Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.702(1), 1.887(0.8), 3.15(0.8),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: ( 0 3 1) ( 1 1 0) ( 1 0 1) ( 1 0 0) ( 0 0 1)

Warning: this large pop-up is very compute intensive and may not work well with some computers.
Click Here for Large Trechmannite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


Matsumoto T , Nowacki W , Zeitschrift fur Kristallographie , 129 (1969) p.163-177, The crystal structure of trechmannite, AgAsS2, Locality: Lengenbach quarry, Binnatal, Canton Wallis, Switzerland

 

Physical Properties of Trechmannite

Help on Cleavage: Cleavage: {1011} Good, {0001} Fair
Help on Color: Color: Scarlet red.
Help on Density: Density: 4.78
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Adamantine
Help on Streak: Streak: scarlet red
 

Optical Properties of Trechmannite

Help on Dichroism (e): Dichroism (e): nearly colorless clear.
Help on Dichroism (w): Dichroism (w): pale reddish.
Help on Optical Data: Optical Data: Uniaxial (-), e=2.4, w=2.6, bire=0.2000.
Help on RL Anisotrophism: RL Anisotrophism: Moderate (in synthetic material).
Help on RL Color: RL Color: White with a bluish cast, with orange-red internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Trechmannite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   37.60   26.20 
   
 420 nm   36.90   25.70 
 440 nm   35.50   24.90 
 460 nm   33.80   23.90 
 480 nm   32.60   23.00 
 500 nm   31.60   23.40 
 520 nm   30.70   23.70 
 540 nm   29.90   23.40 
 560 nm   29.10   22.70 
 580 nm   28.50   22.10 
 600 nm   28.00   21.50 
 620 nm   27.60   21.00 
 640 nm   27.20   20.60 
 660 nm   26.90   20.30 
 680 nm   26.40   20.00 
 700 nm   26.20   19.90 
Calculated Relative Intensity Colors of Trechmannite in Air
Relative
Intensity		    0%   50% 100% 150% 200% 250% 300% 350% 400% 410%
R1                    
R2                    
 

Calculated Properties of Trechmannite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.34 gm/cc
note: Specific Gravity of Trechmannite =4.78 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0019479447
Boson Index = 0.9980520553
Help on Photoelectric: Photoelectric: PETrechmannite = 132.86 barns/electron
U=PETrechmannite x rElectron Density= 576.11 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Trechmannite is Not Radioactive
 

Trechmannite Classification
Help on Dana Class: Dana Class: 03.07.02.01 (03)Sulfides - Sulfosalts
  (03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.02)Dana Group
 
03.07.02.01 Trechmannite AgAsS2 R 3m 3 2/m
Help on Strunz Class: Strunz Class: 02.GC.35 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.G - Sulfarsenites, sulfantimonites, sulfbismuthites
  02.GC -Poly-sulfarsenites
 
02.GC.35 Trechmannite AgAsS2 R 3m 3 2/m
 

Other Trechmannite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Trechmannite :
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

Search for Trechmannite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Trechmannite :

A Bijoux Google Search for Trechmannite
Adam's Minerals Google Search for Trechmannite
Cape Minerals Google Search for Trechmannite
Dakota Matrix Minerals Google Search for Trechmannite
Excalibur Mineral Corp. Google Search for Trechmannite
Exceptional Minerals Google Search for Trechmannite
John Betts Fine Minerals Search for Trechmannite
McDougall Minerals Google Search for Trechmannite
Mineral News Website Link
Rock and Mineral Shows Google Search for Trechmannite
Weinrich Minerals, Inc. Google Search for Trechmannite

Ask about Trechmannite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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

Trechmannite

AgAsS2
Dana No: 03.07.02.01 Strunz No: 02.GC.35
Locality:

 

Notes: