Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Habit:
Pulverulent - Forms a loose, poorly-coherent powdery mass.
Habit:
Scaly - Morphology like fish scales.
Hardness:
4-5 - Fluorite-Apatite
Luster:
Adamantine
Streak:
light yellow
Optical Properties of Bismite
Gladstone-Dale:
CI meas= 0.339 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.372 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.0961,KPDmeas= 0.1011,KC= 0.153 Ncalc = 2.3 - 2.45
Optical Data:
Uniaxial (-), e=1.82, w=2, bire=0.1800.
Calculated Properties of Bismite
Electron Density:
Bulk Density (Electron Density)=7.34 gm/cc note: Specific Gravity of Bismite =9.00 gm/cc.
Fermion Index:
Fermion Index = 0.0000503415 Boson Index = 0.9999496585
Photoelectric:
PEBismite =1,770.07 barns/electron U=PEBismite x rElectron Density=12991.76 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Bismite is Not Radioactive
Chemical Formula: 
