Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).
Habit:
Anhedral Grains - Granular minerals without the expression of crystal shapes
Hardness:
4-5 - Fluorite-Apatite
Luster:
Sub Metallic
Streak:
dark brown
Optical Properties of Stanekite
Gladstone-Dale:
CI meas= -0.189 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.118 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2624,KPDmeas= 0.2789,KC= 0.2347 Ncalc = 1.89 - 1.95
Optical Data:
Biaxial (?), a=2.01, b=2.11,
RL Anisotrophism:
Distinct, pale brownish gray.
RL Bireflectance:
Weak.
RL Color:
Pale gray with reddish yellow to brownish red internal reflections.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Stanekite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
12.86
15.20
420 nm
11.90
14.00
440 nm
11.15
13.05
460 nm
10.90
12.75
480 nm
10.75
12.46
500 nm
10.57
12.33
520 nm
10.41
12.33
540 nm
10.48
12.26
560 nm
10.52
12.25
580 nm
10.68
12.29
600 nm
10.69
12.31
620 nm
10.75
12.30
640 nm
10.77
12.35
660 nm
10.80
12.42
680 nm
10.72
12.33
700 nm
10.54
12.15
Calculated Relative Intensity Colors of Stanekite in Air
Relative Intensity
0%
90%
100%
180%
270%
360%
450%
540%
630%
720%
810%
830%
R1
R2
Calculated Properties of Stanekite
Electron Density:
Bulk Density (Electron Density)=3.87 gm/cc note: Specific Gravity of Stanekite =4.04 gm/cc.
Fermion Index:
Fermion Index = 0.0083145264 Boson Index = 0.9916854736
Photoelectric:
PEStanekite = 14.64 barns/electron U=PEStanekite x rElectron Density= 56.74 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Stanekite is Not Radioactive
Stanekite Classification
Dana Class:
41.06.03.04(41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
Chemical Formula: 
