Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
6 - Orthoclase
Luster:
Adamantine - Resinous
Streak:
brown
Optical Properties of Gaudefroyite
Dichroism (e):
pale yellowish brown.
Dichroism (w):
red orange.
Gladstone-Dale:
CI meas= -0.108 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.123 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2707,KPDmeas= 0.2672,KC= 0.2411 Ncalc = 1.81 - 1.84
Optical Data:
Uniaxial (+), w=1.81, e=2.02, bire=0.2100.
RL Anisotrophism:
Strong in pale grays.
RL Color:
Gray with strong yellow-orange to reddish internal reflections.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Gaudefroyite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
11.20
15.40
420 nm
10.80
14.80
440 nm
10.40
14.20
460 nm
10.10
13.80
480 nm
9.90
13.40
500 nm
9.70
13.10
520 nm
9.60
12.80
540 nm
9.60
12.60
560 nm
9.50
12.30
580 nm
9.50
12.20
600 nm
9.40
12.10
620 nm
9.40
12.00
640 nm
9.30
11.90
660 nm
9.30
11.80
680 nm
9.30
11.70
700 nm
9.30
11.70
Calculated Relative Intensity Colors of Gaudefroyite in Air
Relative Intensity
0%
100%
200%
300%
400%
500%
600%
700%
800%
900%
920%
R1
R2
Calculated Properties of Gaudefroyite
Electron Density:
Bulk Density (Electron Density)=3.34 gm/cc note: Specific Gravity of Gaudefroyite =3.43 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEGaudefroyite = 9.52 barns/electron U=PEGaudefroyite x rElectron Density= 31.80 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Gaudefroyite is Not Radioactive
Chemical Formula: 
