Quadratite Mineral Data

Quadratite Mineral Data

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General Quadratite Information

Chemical Formula:

Ag(Cd,Pb)AsS3

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 %

Empirical Formula:

AgCd_0.8Pb_0.2AsS₃

Environment:

Found in small vugs in dolomitic rock.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Lengenbach, Binntal, Switzerland. Link to MinDat.org Location Data.

Name Origin:

The name is derived from the conspicuous quadratic shape of the mineral.

Synonym:

IMA1994-038

Quadratite Image

Images:

Quadratite

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

Images:

Quadratite

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

Axial Ratios:

a:c = 1:6.16657

Cell Dimensions:

a = 5.499, c = 33.91, Z = 8; V = 1,025.41 Den(Calc)= 5.32

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/amd

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.77(1), 1.96(0.8), 1.598(0.7),1.679(0.7), 1.274(0.6), 3.19(0.5),

Forms:

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Forms: [ 1 1 6] [ 1 1 1] [ 1 0 4] [ 1 0 3] [ 0 0 1]

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Physical Properties of Quadratite

Cleavage:

[001] Perfect, [110] Distinct

Color:

Gray, Reddish gray.

Diaphaniety:

Opaque to translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luster:

Sub Metallic

Streak:

reddish brown

Optical Properties of Quadratite

RL Color:

Grayish white with a bluish tint, dark red internal reflections in oil along cleavage tracks.

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**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%
R₁
R₂

Calculated Properties of Quadratite

Electron Density:

r_electron=4.74 gm/cc
note: r_Quadratite=5.32 gm/cc.

Fermion Index

Fermion Index = 0.07892
Boson Index = 0.92108

Photoelectric:

PE_Quadratite= 315.13 barns/electron
U=PE_Quadratite x r_electron=1,493.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Quadratite is Not Radioactive

Quadratite Classification

Dana Class:

3.4.11.3 (3)Sulfides - Sulfosalts

(3.4)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.4.11)Dana Group

3.4.11.1 Routhierite TlCu(Hg,Zn)2(As,Sb)2S3 I 4mm 4mm

3.4.11.2 Stalderite TlCu(Zn,Fe,Hg)2As2S6 I 42m 4 2m

3.4.11.3 Quadratite ! Ag(Cd,Pb)AsS3 I 4/amd 4/m 2/m 2/m

Strunz Class:

II/E.07-60 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Silver, x = 6.0 - 1.6

II/E.07 - Proustite - Samsonite series

II/E.07-10 Proustite Ag3AsS3 R 3c 3 2/m

II/E.07-20 Pyrargyrite Ag3SbS3 R 3c 3m

II/E.07-30 Xanthoconite Ag3AsS3 A2/a 2/m

II/E.07-40 Pyrostilpnite Ag3SbS3 P 2₁/c 2/m

II/E.07-50 Samsonite Ag4MnSb2S6 P 2/n 2/m

II/E.07-60 Quadratite Ag(Cd,Pb)AsS3 I 4/amd 4/m 2/m 2/m

Other Quadratite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(AmMin, V 85, p264) OPTIC PROP.(AmMin, V 85, p264)

See Also:

Links to other databases for Quadratite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Quadratite

Ag(Cd,Pb)AsS3
Dana No: 3.4.11.3 Strunz No: II/E.07-60
Locality:

Notes: