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Physical Properties of Fetiasite
Cleavage:
{100} Perfect
Color:
Brown, Black.
Density:
4.6
Diaphaneity:
Opaque
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
5 - Apatite
Luminescence:
Non-fluorescent.
Luster:
Sub Metallic
Streak:
ochre brown
Optical Properties of Fetiasite
Optical Data:
Biaxial (?)
NCalc= 2.16 - from Gladstone-Dale relationship (KC = 0.2409) where Ncalc=Dcalc*KC+1 NCalc= 2.11 - from Gladstone-Dale relationship (KC = 0.2409) where Ncalc=Dmeas*KC+1
RL Anisotrophism:
Noted along grain boundaries.
RL Color:
Creamy white.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Fetiasite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
470 nm
15.40
16.00
546 nm
15.30
15.80
589 nm
14.80
15.20
650 nm
14.20
15.00
Calculated Relative Intensity Colors of Fetiasite in Air
Relative Intensity
0%
60%
100%
120%
180%
240%
300%
360%
420%
480%
540%
600%
R1
R2
Calculated Properties of Fetiasite
Electron Density:
Bulk Density (Electron Density)=4.49 gm/cc note: Specific Gravity of Fetiasite =4.82 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEFetiasite = 35.96 barns/electron U=PEFetiasite x rElectron Density= 161.38 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Fetiasite is Not Radioactive
Fetiasite Classification
Dana Class:
45.01.13.01(45)Acid and normal Antimonites, Arsenites and Phosphites
Chemical Formula: 
