Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Fluorcaphite
Gladstone-Dale:
CI meas= -0.052 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.074 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1572,KPDmeas= 0.1786,KC= 0.1698 Ncalc = 1.61 - 1.69
Optical Data:
Uniaxial (-), e=1.637, w=1.649, bire=0.0120.
Calculated Properties of Fluorcaphite
Electron Density:
Bulk Density (Electron Density)=3.35 gm/cc note: Specific Gravity of Fluorcaphite =3.60 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEFluorcaphite = 128.09 barns/electron U=PEFluorcaphite x relectron= 429.62 barns/cc.
Radioactivity:
GRapi = 20,739.74 (Gamma Ray American Petroleum Institute Units)
Concentration of Fluorcaphite per GRapi unit = 48.22 (PPM)
Fluorcaphite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Fluorcaphite - weak
Specimen Size Weight/Volume (Sphere) *
Calculated Activity Bequerols (Bq)
Calculated Activity Curies (Ci)
Estimated Activity GR(api)
Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.10 cm
467,481
1.26E-05
20,739.74
6.82
100 gm / 3.76 cm
46,748
1.26E-06
2,073.97
0.68
10 gm / 1.74 cm
4,675
1.26E-07
207.40
0.07
1 gm / 8.10 mm
467
1.26E-08
20.74
0.01
0.1 gm / 3.76 mm
47
1.26E-09
2.07
0.00
0.01 gm / 1.74 mm
5
1.26E-10
0.21
0.00
0.001 gm / 0.81 mm
0
1.26E-11
0.02
0.00
Weight of pure Fluorcaphite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.60 gm/cc.*
Goverment Estimate of Average Annual Exposure (
360 mRem)
** Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 1.04 % Th) From Sum REE Elements (20.87 % REE)
Fluorcaphite Classification
Dana Class:
41.08.01.08(41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
Chemical Formula: 
- weak