Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.
Hardness:
5 - Apatite
Luster:
Sub Metallic
Streak:
dark brown
Optical Properties of Kentrolite
Gladstone-Dale:
CI meas= -0.062 (Fair) - where the CI = (1-KPDmeas/KC) CI calc= -0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1925,KPDmeas= 0.1944,KC= 0.183 Ncalc = 2.13 - 2.14
Optical Data:
Biaxial (+), a=2.1, b=2.2, g=2.31, bire=0.2100, 2V(Calc)=88, 2V(Meas)=88. Dispersion strong, r < v.
Pleochroism (x):
bright yellowish pink.
Pleochroism (y):
reddish brown.
Pleochroism (z):
deep brownish red.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Kentrolite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
14.70
18.70
420 nm
14.40
18.10
440 nm
14.10
17.50
460 nm
13.90
16.90
480 nm
13.60
16.40
500 nm
13.40
16.00
520 nm
13.20
15.70
540 nm
13.00
15.40
560 nm
12.90
15.20
580 nm
12.80
15.00
600 nm
12.60
14.90
620 nm
12.50
14.80
640 nm
12.50
14.70
660 nm
12.40
14.50
680 nm
12.40
14.40
700 nm
12.30
14.30
Calculated Relative Intensity Colors of Kentrolite in Air
Relative Intensity
0%
70%
100%
140%
210%
280%
350%
420%
490%
560%
630%
690%
R1
R2
Calculated Properties of Kentrolite
Electron Density:
Bulk Density (Electron Density)=5.43 gm/cc note: Specific Gravity of Kentrolite =6.25 gm/cc.
Fermion Index:
Fermion Index = 0.13 Boson Index = 0.87
Photoelectric:
PEKentrolite =1,013.97 barns/electron U=PEKentrolite x rElectron Density=5,503.35 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Kentrolite is Not Radioactive
Kentrolite Classification
Dana Class:
56.02.10.02(56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
(56.02)with cations in [4] and/or >[4] coordination
Chemical Formula: 
