Mineralogy Database

Quadratite Mineral Data

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General Quadratite Information

Help on Chemical  Formula: Chemical Formula: Ag(Cd,Pb)AsS3
Help on Composition: Composition: Molecular Weight = 410.36 gm
   Cadmium  21.91 %  Cd
   Silver   26.29 %  Ag
   Arsenic  18.26 %  As
   Lead     10.10 %  Pb
   Sulfur   23.44 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: AgCd0.8Pb0.2AsS3
Help on Environment: Environment: Found in small vugs in dolomitic rock.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Lengenbach, Binntal, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name is derived from the conspicuous quadratic shape of the mineral.
Help on Synonym: Synonym: IMA1994-038

Quadratite Image

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Comments: Tabular crystals of quadratite with small silvery gray, rounded crystals of galena.
Location: Lengenbach quarry, Binntal, Wallis (Valais), Switzerland. Scale: Picture size 0.8 mm.
© Thomas Witzke / Abraxas-Verlag

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Comments: Aggregate of 3 black tabular crystals of quadratite (reflecting light) on jordanite/lengenbachite and white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal size 0.2 mm.
© Walter Gabriel

Quadratite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:6.16657
Help on Cell Dimensions: Cell Dimensions: a = 5.499, c = 33.91, Z = 8; V = 1,025.41 Den(Calc)= 5.32
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4/amd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.77(1), 1.96(0.8), 1.598(0.7),1.679(0.7), 1.274(0.6), 3.19(0.5),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 6) ( 1 1 1) ( 1 0 4) ( 1 0 3) ( 0 0 1)

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Physical Properties of Quadratite

Help on Cleavage: Cleavage: {001} Perfect, {110} Distinct
Help on Color: Color: Gray, Reddish gray.
Help on Diaphaneity: Diaphaneity: Opaque to translucent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: reddish brown

Optical Properties of Quadratite

Help on RL Color: RL Color: Grayish white with a bluish tint, dark red internal reflections in oil along cleavage tracks.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Quadratite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   30.50   32.30 
 543 nm   29.60   30.80 
 587 nm   28.70   29.70 
 657 nm   26.30   28.00 
Calculated Relative Intensity Colors of Quadratite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320%

Calculated Properties of Quadratite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.74 gm/cc
note: Specific Gravity of Quadratite =5.32 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEQuadratite = 315.13 barns/electron
U=PEQuadratite x rElectron Density=1,493.64 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Quadratite is Not Radioactive

Quadratite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.04)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.04.11)Dana Group Routhierite TlCu(Hg,Zn)2(As,Sb)2S3 I 4mm 4mm Stalderite TlCu(Zn,Fe,Hg)2As2S6 I 42m 4 2m Quadratite! Ag(Cd,Pb)AsS3 I 4/amd 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.GC.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.G - Sulfarsenites, sulfantimonites, sulfbismuthites
  02.GC -Poly-sulfarsenites
02.GC.25 Quadratite! Ag(Cd,Pb)AsS3 I 4/amd 4/m 2/m 2/m

Other Quadratite Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(AmMin, V 85, p264) OPTIC PROP.(AmMin, V 85, p264)
Help on See Also: See Also: Links to other databases for Quadratite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: Strunz No: 02.GC.25





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