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de Villiers J P R , Dobson S M , Buseck P R , European Journal of Mineralogy , 3 (1991) p.567-573, Refinement of the crystal structure of neltnerite,, a member of the bixbyite-braunite group of minerals
Physical Properties of Neltnerite
Cleavage:
{???} Indistinct
Color:
Black.
Density:
4.63
Diaphaneity:
Opaque
Fracture:
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Hardness:
6 - Orthoclase
Luster:
Sub Metallic
Streak:
black
Optical Properties of Neltnerite
Optical Data:
NCalc= 2.31 - from Gladstone-Dale relationship (KC = 0.2829) where Ncalc=Dcalc*KC+1 NCalc= 2.31 - from Gladstone-Dale relationship (KC = 0.2829) where Ncalc=Dmeas*KC+1
Calculated Properties of Neltnerite
Electron Density:
Bulk Density (Electron Density)=4.41 gm/cc note: Specific Gravity of Neltnerite =4.64 gm/cc.
Fermion Index:
Fermion Index = 0.0024718426 Boson Index = 0.9975281574
Photoelectric:
PENeltnerite = 15.62 barns/electron U=PENeltnerite x rElectron Density= 68.81 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Neltnerite is Not Radioactive