Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Fibrous - Crystals made up of fibers.
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Habit:
Spherical - Spherical, rounded aggregates.
Hardness:
5-5.5 - Apatite-Knife Blade
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Thomsonite-Ca
Gladstone-Dale:
CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2222,KPDmeas= 0.2232,KC= 0.225 Ncalc = 1.52 - 1.54
Optical Data:
Biaxial (+), a=1.511-1.53, b=1.513-1.532, g=1.516-1.545, bire=0.0050-0.0150, 2V(Calc)=44-80, 2V(Meas)=44-75. Dispersion distinct to strong, r > v.
Pleochroism (x):
colorless.
Pleochroism (y):
colorless.
Calculated Properties of Thomsonite-Ca
Electron Density:
Bulk Density (Electron Density)=2.37 gm/cc note: Specific Gravity of Thomsonite-Ca =2.35 gm/cc.
Fermion Index:
Fermion Index = 0.0085147492 Boson Index = 0.9914852508
Photoelectric:
PEThomsonite-Ca = 2.44 barns/electron U=PEThomsonite-Ca x rElectron Density= 5.78 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Thomsonite-Ca is Not Radioactive
Chemical Formula: 
