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Stock List Crystals & Substrates

Stock List Targets

Color

Black

Cleavage

{010} Perfect, {100} Parting, {102} Parting

Density

7.5 - 7.4, Average = 7.45

Diaphaneity

Nearly opaque

Hardness

4.5 - Between Fluorite and Apatite

Gladstone-Dale

Cl meas = -0.016 (Superior) - where the Cl = (1-KPDmeas/KC)
Cl calc  =  0.002 (Superior) - where the Cl = (1-KPDcalc/KC)
KPDcalc = 0.1748, KPDmeas = 0.1778, KC = 0.175
Ncalc = 2.3 - 2.33
 

Optical Data

Biaxial (+)
a = 2.255, b = 2.305. g = 2.414
bire = 0.1590, 2V(Calc) = 72, 2V(Meas) = 68
 

RL Bireflectance

Weak

Refectivity

4 0 0 n m

16.50

19.50

4 2 0 n m

16.40

19.20

4 4 0 n m

16.30

18.90

4 6 0 n m

16.20

18.70

4 8 0 n m

15.90

18.50

5 0 0 n m

16.00

18.70

5 2 0 n m

16.00

18.70

5 4 0 n m

16.00

18.70

5 6 0 n m

16.00

18.70

5 8 0 n m

15.80

18.60

6 0 0 n m

15.80

18.60

6 2 0 n m

15.70

18.60

6 4 0 n m

15.60

18.50

6 6 0 n m

15.50

18.30

6 8 0 n m

15.40

18.10

7 0 0 n m

15.50

18.00

Composition

Molecular Weight = 303.69 gm

Axial Ratios

a:b:c = 0.838:1:0.8661

Cell Dimensions

a = 4.76
b = 5.68
c = 4.92
Z = 2
beta = 90.016°
V = 133.02 Den(Cal) = 7.58
 

Crystal System

Monoclinic - Prismatic
H-M Symbol (2/m) Space Group: P 2/c
 

Orientations

[110]  [110] [100] [011] [001]

Electron Density

Bulk Density (Electron Density) = 6.59 gm/cc
Specific Gravity of Ferberite = 7.58 gm/cc
 

Fermion Index

Fermion Index = 0.09
Boson Index = 0.91
 

Photoelectric

PE_Ferberite = 757.55 barns/electron
U = PE_Ferberite x rElectron Density = 4,991.71 barns/cc