Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Striated - Parallel lines on crystal surface or cleavage face.
Hardness:
4.5-5 - Near Apatite
Luster:
Sub Metallic
Streak:
white
Optical Properties of Vigezzite
Gladstone-Dale:
CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.222,KPDmeas= 0.2216,KC= 0.2201 Ncalc = 2.22
Bulk Density (Electron Density)=4.98 gm/cc note: Specific Gravity of Vigezzite =5.54 gm/cc.
Fermion Index:
Fermion Index = 0.0085915604 Boson Index = 0.9914084396
Photoelectric:
PEVigezzite = 410.44 barns/electron U=PEVigezzite x relectron=2,044.09 barns/cc.
Radioactivity:
GRapi = 7,219.41 (Gamma Ray American Petroleum Institute Units)
Concentration of Vigezzite per GRapi unit = 138.52 (PPM)
Vigezzite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Vigezzite - 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 / 7.01 cm
168,647
4.56E-06
7,219.41
2.37
100 gm / 3.25 cm
16,865
4.56E-07
721.94
0.24
10 gm / 1.51 cm
1,686
4.56E-08
72.19
0.02
1 gm / 7.01 mm
169
4.56E-09
7.22
0.00
0.1 gm / 3.25 mm
17
4.56E-10
0.72
0.00
0.01 gm / 1.51 mm
2
4.56E-11
0.07
0.00
0.001 gm / 0.70 mm
0
4.56E-12
0.01
0.00
Weight of pure Vigezzite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.54 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 ( 0.38 % Th) From Sum REE Elements ( 7.53 % REE)
Vigezzite Classification
Dana Class:
08.03.07.01(08)Multiple Oxides with Nb, Ta, and Ti
Chemical Formula: 
- mild