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Jarosch D , Zeitschrift fur Kristallographie , 185 (1988) p.605-605, Crystal structure of iwakiite, Locality: Gozaisho mine, Fukushima Prefecture, Japan, Note: coordinates from ICSD, reproduce reported bond lengths
Physical Properties of Iwakiite
Cleavage:
None
Color:
Greenish black.
Density:
4.85
Diaphaneity:
Opaque
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Anhedral Grains - Granular minerals without the expression of crystal shapes
Hardness:
6-6.5 - Orthoclase-Pyrite
Luster:
Metallic
Magnetism:
Strongly magnetic
Streak:
black
Optical Properties of Iwakiite
Optical Data:
Uniaxial (?).
NCalc= 2.03 - from Gladstone-Dale relationship (KC = 0.2094) where Ncalc=Dcalc*KC+1 NCalc= 2.02 - from Gladstone-Dale relationship (KC = 0.2094) where Ncalc=Dmeas*KC+1
RL Anisotrophism:
Moderate, yellowish to brownish gray.
RL Color:
Light olive gray.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Iwakiite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
420 nm
20.00
19.40
440 nm
19.90
19.30
460 nm
20.30
19.50
480 nm
20.40
19.60
500 nm
20.80
19.80
520 nm
21.20
20.10
540 nm
21.40
20.30
560 nm
21.30
20.40
580 nm
21.20
20.10
600 nm
21.00
20.00
620 nm
20.90
19.70
640 nm
20.50
19.60
660 nm
20.40
19.20
680 nm
20.20
19.10
Calculated Relative Intensity Colors of Iwakiite in Air
Relative Intensity
0%
50%
100%
150%
200%
250%
300%
350%
400%
450%
R1
R2
Calculated Properties of Iwakiite
Electron Density:
Bulk Density (Electron Density)=4.64 gm/cc note: Specific Gravity of Iwakiite =4.93 gm/cc.
Fermion Index:
Fermion Index = 0.006825684 Boson Index = 0.993174316
Photoelectric:
PEIwakiite = 20.39 barns/electron U=PEIwakiite x rElectron Density= 94.68 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Iwakiite is Not Radioactive