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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
Diaphaneity:
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:
Non-fluorescent.
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:
Bulk Density (Electron Density)=8.42 gm/cc note: Specific Gravity of Dyscrasite =9.76 gm/cc.
Fermion Index:
Fermion Index = 0 Boson Index = 1
Photoelectric:
PEDyscrasite = 285.26 barns/electron U=PEDyscrasite x rElectron Density=2,400.56 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Dyscrasite is Not Radioactive
Dyscrasite Classification
Dana Class:
02.02.01.01(02)Sulfides - Including Selenides and Tellurides