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Jansen E , Kyek A , Schafer W , Schwertmann U , Applied Physics , A74 (2002) p.S1004-S1006, The structure of six-line ferrihydrite, Locality: synthetic, Sample: defect-free refinement
Physical Properties of Ferrihydrite
Color:
Yellow brown, Dark brown.
Density:
3.8
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Microscopic Crystals - Crystals visible only with microscopes.
Streak:
yellowish brown
Optical Properties of Ferrihydrite
Optical Data:
NCalc= 2.24 - from Gladstone-Dale relationship (KC = 0.3163) where Ncalc=Dcalc*KC+1 NCalc= 2.2 - from Gladstone-Dale relationship (KC = 0.3163) where Ncalc=Dmeas*KC+1
Calculated Properties of Ferrihydrite
Electron Density:
Bulk Density (Electron Density)=3.77 gm/cc note: Specific Gravity of Ferrihydrite =3.93 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEFerrihydrite = 20.08 barns/electron U=PEFerrihydrite x rElectron Density= 75.77 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ferrihydrite is Not Radioactive