Dyscrasite Mineral Data

Dyscrasite Mineral Data +

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General Dyscrasite Information

Chemical Formula:

Ag3Sb

Composition:

Molecular Weight = 445.35 gm

Silver 72.66 % Ag

Antimony 27.34 % Sb

______

100.00 %

Empirical Formula:

Ag₃Sb

Environment:

Occurs in some silver deposits.

IMA Status:

Valid Species (Pre-IMA) 1832

Locality:

Wolfach, Baden, Germany. Link to MinDat.org Location Data.

Name Origin:

From the Greek, meaning "bad alloy."

Synonym:

Antimonsilver

ICSD 64698

PDF 10-452

Dyscrasite Image

Images:

Dyscrasite

Comments: Metallic-silver, prismatic, crystallized dyscrasite. Individual crystal spears to 8 mm in size.
Location: Mine #21, Pribram, Bohemia, Czech Republic. Scale: 6 x 10 x 6.5 cm.
© Dan Weinrich

Dyscrasite Crystallography

Axial Ratios:

a:b:c =0.5723:1:0.9226

Cell Dimensions:

a = 2.996, b = 5.235, c = 4.83, Z = 1; V = 75.75 Den(Calc)= 9.76

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pm2m

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

By Intensity(I/I_o): 2.29(1), 1.37(0.4), 2.42(0.4),

Forms:

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Forms: [ 0 2 1] [ 1 1 1]

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Crystal Structure:

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Scott J D , The Canadian Mineralogist , 14 (1976) p.139-142, Refinement of the crystal structure of dyscrasite, and its implications, for the structure of allargentum

Physical Properties of Dyscrasite

Cleavage:

[001] Distinct, [011] Distinct, [110] Imperfect

Color:

Gray, Yellow, Black, Silver white.

Density:

9.4 - 10, Average = 9.69

Diaphaniety:

Opaque

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Scaly - Morphology like fish scales.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

None.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

silver white

Optical Properties of Dyscrasite

RL Anisotrophism:

Weak.

RL Color:

Silver white, tarnishing to lead-gray, yellowish, or black.

RL Pleochroism:

Very weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Dyscrasite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	57.00	57.70
420 nm	57.70	59.00
440 nm	58.30	60.10
460 nm	59.10	61.20
480 nm	59.60	61.70
500 nm	59.90	62.10
520 nm	60.00	62.40
540 nm	60.10	62.70
560 nm	60.00	62.90
580 nm	59.80	63.00
600 nm	59.60	63.00
620 nm	59.50	63.00
640 nm	59.40	63.10
660 nm	59.30	63.00
680 nm	59.30	63.10
700 nm	59.60	63.40

**Calculated Relative Intensity Colors of Dyscrasite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	150%
R₁
R₂

Calculated Properties of Dyscrasite

Electron Density:

r_electron=8.42 gm/cc
note: r_Dyscrasite=9.76 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Dyscrasite= 285.26 barns/electron
U=PE_Dyscrasite x r_electron=2,400.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Dyscrasite is Not Radioactive

Dyscrasite Classification

Dana Class:

2.2.1.1 (2)Sulfides - Including Selenides and Tellurides

(2.2)where Am Bn Xp, with (m+n):p=3:1

(2.2.1)Dana Group

2.2.1.1 Dyscrasite Ag3Sb Pm2m mm2

2.2.1.2 Allargentum Ag1-xSbx(x=0.009-0.16) P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

II/A.02-20 II - Sulfides and sulphosalts

II/A - Alloys and alloylike compounds, with Copper, Silver, Gold and Nickel

II/A.02 - Allargentum - Dyscrasite series

II/A.02-10 Allargentum Ag1-xSbx(x=0.009-0.16) P 6₃/mmc 6/m 2/m 2/m

II/A.02-20 Dyscrasite Ag3Sb Pm2m mm2

Other Dyscrasite Information

References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

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Dyscrasite

Ag3Sb
Dana No: 2.2.1.1 Strunz No: II/A.02-20
Locality:

Notes: