Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Optical Properties of Renardite
Gladstone-Dale:
CI meas= -0.285 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.262 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1652,KPDmeas= 0.1682,KC= 0.1309 Ncalc = 1.57 - 1.58
Optical Data:
Biaxial (-), a=1.715, b=1.736, g=1.739, bire=0.0240, 2V(Calc)=40, 2V(Meas)=41. Dispersion r > v.
Calculated Properties of Renardite
Electron Density:
Bulk Density (Electron Density)=3.78 gm/cc note: Specific Gravity of Renardite =4.42 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PERenardite =1,735.65 barns/electron U=PERenardite x relectron=6,554.45 barns/cc.
Radioactivity:
GRapi = 4,148,547.89 (Gamma Ray American Petroleum Institute Units)
Concentration of Renardite per GRapi unit = 241.05 (PPB)
Renardite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Renardite - very strong
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 / 7.56 cm
101,968,247
2.76E-03
4,148,547.89
1,363.91
100 gm / 3.51 cm
10,196,825
2.76E-04
414,854.79
136.39
10 gm / 1.63 cm
1,019,682
2.76E-05
41,485.48
13.64
1 gm / 7.56 mm
101,968
2.76E-06
4,148.55
1.36
0.1 gm / 3.51 mm
10,197
2.76E-07
414.85
0.14
0.01 gm / 1.63 mm
1,020
2.76E-08
41.49
0.01
0.001 gm / 0.76 mm
102
2.76E-09
4.15
0.00
Weight of pure Renardite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.42 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
Renardite Classification
Dana Class:
42.04.09.02(42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
Chemical Formula: 
- very strong