Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Takedaite
Gladstone-Dale:
CI meas= -0.034 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2194,KPDmeas= 0.2187,KC= 0.2115 Ncalc = 1.65 - 1.66
Optical Data:
Uniaxial (-), e=1.63, w=1.726, bire=0.0960.
Calculated Properties of Takedaite
Electron Density:
Bulk Density (Electron Density)=3.08 gm/cc note: Specific Gravity of Takedaite =3.10 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PETakedaite = 6.32 barns/electron U=PETakedaite x rElectron Density= 19.45 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Takedaite is Not Radioactive