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Physical Properties of Miargyrite
Cleavage:
{010} Imperfect
Color:
Steel gray, Lead gray, Blackish red, Reddish gray.
Density:
5.1 - 5.3, Average = 5.19
Diaphaneity:
Translucent to Subopaque
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Disseminated - Occurs in small, distinct particles dispersed in matrix.
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
2-2.5 - Gypsum-Finger Nail
Luminescence:
Non-fluorescent.
Luster:
Sub Metallic
Streak:
cherry red
Optical Properties of Miargyrite
Gladstone-Dale:
CI meas= -4.079 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -4.04 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.334,KPDmeas= 0.3365,KC= 0.0663 Ncalc = 1.34 - 1.35
Optical Data:
Biaxial (+), a=2.72, g=2.78, bire=0.0600
Pleochroism (x):
deep cherry red.
Pleochroism (z):
deep cherry red.
RL Anisotrophism:
Strong.
RL Color:
White with raspberry-red internal reflections in oil, seldom seen in air.
RL Pleochroism:
Distinct, in whites, light gray-whites, and whitish grays.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Miargyrite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
37.30
39.80
420 nm
37.10
40.00
440 nm
36.90
39.45
460 nm
36.50
39.05
480 nm
35.85
38.60
500 nm
34.95
38.05
520 nm
34.05
37.30
540 nm
33.30
36.55
560 nm
32.75
35.90
580 nm
32.10
35.30
600 nm
31.30
34.75
620 nm
30.55
34.00
640 nm
29.90
33.20
660 nm
29.25
32.35
680 nm
28.80
31.85
700 nm
28.60
31.55
Standardized Intensity (100%) Reflection Spectra of Miargyrite in Oil
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
22.00
24.90
420 nm
21.85
24.95
440 nm
21.55
24.40
460 nm
21.10
23.85
480 nm
20.35
23.35
500 nm
19.45
22.60
520 nm
18.60
21.90
540 nm
17.95
21.20
560 nm
17.40
20.50
580 nm
16.80
19.95
600 nm
16.20
19.50
620 nm
15.50
18.75
640 nm
14.90
18.00
660 nm
14.40
17.30
680 nm
14.05
16.85
700 nm
13.95
16.75
Calculated Relative Intensity Colors of Miargyrite in Air
Relative Intensity
0%
30%
60%
90%
100%
120%
150%
180%
210%
240%
270%
290%
R1
R2
Calculated Relative Intensity Colors of Miargyrite in Oil
Relative Intensity
0%
60%
100%
120%
180%
240%
300%
360%
420%
480%
540%
550%
R1
R2
Calculated Properties of Miargyrite
Electron Density:
Bulk Density (Electron Density)=4.64 gm/cc note: Specific Gravity of Miargyrite =5.24 gm/cc.
Fermion Index:
Fermion Index = 0.0016374117 Boson Index = 0.9983625883
Photoelectric:
PEMiargyrite = 233.54 barns/electron U=PEMiargyrite x rElectron Density=1,083.15 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Miargyrite is Not Radioactive
Chemical Formula: 
