Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
3.5-4.5 - Between Copper Penny and Fluorite-Apatite
Luster:
Earthy (Dull)
Streak:
yellow
Optical Properties of Stetefeldtite
Gladstone-Dale:
CI meas= -0.122 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.212 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1908,KPDmeas= 0.1766,KC= 0.1573 Ncalc = 1.78 - 1.85
Optical Data:
Isotropic, n=1.95.
Calculated Properties of Stetefeldtite
Electron Density:
Bulk Density (Electron Density)=4.75 gm/cc note: Specific Gravity of Stetefeldtite =5.38 gm/cc.
Fermion Index:
Fermion Index = 0.0000941581 Boson Index = 0.9999058419
Photoelectric:
PEStetefeldtite = 239.21 barns/electron U=PEStetefeldtite x rElectron Density=1,136.71 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Stetefeldtite is Not Radioactive