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Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Habit:
Massive - Granular - Common texture observed in granite and other igneous rock.
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Sub Metallic
Magnetism:
Nonmagnetic
Streak:
reddish black
Optical Properties of Pearceite
Gladstone-Dale:
CI meas= -1.009 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.993 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2742,KPDmeas= 0.2764,KC= 0.1376 Ncalc = 1.85
Optical Data:
Biaxial (?), a=2.7
RL Anisotrophism:
Moderate, often dark violet.
RL Color:
White, with very dark red internal reflections.
RL Pleochroism:
Very weak in air, fair in oil.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Pearceite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
34.80
34.30
420 nm
34.20
34.20
440 nm
33.40
34.10
460 nm
32.50
33.80
480 nm
31.50
33.20
500 nm
30.60
32.80
520 nm
29.80
32.50
540 nm
29.30
32.30
560 nm
29.00
32.00
580 nm
29.00
31.70
600 nm
29.10
31.20
620 nm
29.10
30.70
640 nm
28.90
30.20
660 nm
28.60
29.80
680 nm
28.00
29.30
700 nm
27.40
29.10
Calculated Relative Intensity Colors of Pearceite in Air
Relative Intensity
0%
40%
80%
100%
120%
160%
200%
240%
280%
300%
R1
R2
Calculated Properties of Pearceite
Electron Density:
Bulk Density (Electron Density)=5.56 gm/cc note: Specific Gravity of Pearceite =6.20 gm/cc.
Fermion Index:
Fermion Index = 0.0012616575 Boson Index = 0.9987383425
Photoelectric:
PEPearceite = 184.23 barns/electron U=PEPearceite x rElectron Density=1,023.75 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pearceite is Not Radioactive
Chemical Formula: 
