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McGinnety J A , Acta Crystallographica, Section B , 28 (1972) p.2845-2852, Redetermination of the structures of potassium sulphate and potassium chromate:, the effect of electrostatic crystal forces upon observed bond length
Physical Properties of Tarapacaite
Cleavage:
{001} Distinct, {010} Distinct
Color:
Yellow, Light yellow.
Density:
2.74
Diaphaneity:
Transparent
Luster:
Vitreous (Glassy)
Streak:
light yellow
Optical Properties of Tarapacaite
Gladstone-Dale:
CI meas= 0.027 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2603,KPDmeas= 0.2603,KC= 0.2676 Ncalc = 1.73
Bulk Density (Electron Density)=2.65 gm/cc note: Specific Gravity of Tarapacaite =2.74 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PETarapacaite = 10.15 barns/electron U=PETarapacaite x relectron= 26.92 barns/cc.
Radioactivity:
GRapi = 562.48 (Gamma Ray American Petroleum Institute Units)
Concentration of Tarapacaite per GRapi unit =1,777.84 (PPM)
Estimated Radioactivity from Tarapacaite - mild
Specimen Size Weight/Volume (Sphere) *
Calculated Activity Becquerels (Bq)
Calculated Activity Curies (Ci)
Estimated Activity GR(api)
Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.87 cm
12,201
3.30E-07
562.48
0.18
100 gm / 4.12 cm
1,220
3.30E-08
56.25
0.02
10 gm / 1.91 cm
122
3.30E-09
5.62
0.00
1 gm / 8.87 mm
12
3.30E-10
0.56
0.00
0.1 gm / 4.12 mm
1
3.30E-11
0.06
0.00
0.01 gm / 1.91 mm
0
3.30E-12
0.01
0.00
0.001 gm / 0.89 mm
0
3.30E-13
0.00
0.00
Weight of pure Tarapacaite in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.74 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