Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Kochite
Gladstone-Dale:
CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2087,KPDmeas= 0.2105,KC= 0.2174 Ncalc = 1.72 - 1.73
Bulk Density (Electron Density)=3.22 gm/cc note: Specific Gravity of Kochite =3.32 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEKochite = 23.77 barns/electron U=PEKochite x relectron= 76.48 barns/cc.
Radioactivity:
GRapi = 671.86 (Gamma Ray American Petroleum Institute Units)
Concentration of Kochite per GRapi unit =1,488.39 (PPM)
Estimated Radioactivity from Kochite - mild
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 / 8.32 cm
14,561
3.94E-07
671.86
0.22
100 gm / 3.86 cm
1,456
3.94E-08
67.19
0.02
10 gm / 1.79 cm
146
3.94E-09
6.72
0.00
1 gm / 8.32 mm
15
3.94E-10
0.67
0.00
0.1 gm / 3.86 mm
1
3.94E-11
0.07
0.00
0.01 gm / 1.79 mm
0
3.94E-12
0.01
0.00
0.001 gm / 0.83 mm
0
3.94E-13
0.00
0.00
Weight of pure Kochite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.32 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 ( 0.03 % Th) From Sum REE Elements ( 0.65 % REE)
Kochite Classification
Dana Class:
56.02.04.17(56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
(56.02)with cations in [4] and/or >[4] coordination
Chemical Formula: 
- mild