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Brugger J , Krivovichev S V , Berlepsch P , Meisser N , Ansermet S , Armbruster T , American Mineralogist , 89 (2004) p.339-347, Spriggite, Pb3[(UO2)6O8(OH)2](H2O)3, a new mineral with beta-U3O8 - type sheets:, Description and crystal structure
Physical Properties of Spriggite
Cleavage:
{100} Good
Color:
Bright orange.
Diaphaneity:
Transparent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
4 - Fluorite
Luster:
Vitreous (Glassy)
Streak:
pale orange
Optical Properties of Spriggite
Gladstone-Dale:
CI calc= -0.087 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1216,KC= 0.1119 Ncalc = 1.78
Optical Data:
Biaxial (?), a=1.807, g=1.891, bire=0.0840
Calculated Properties of Spriggite
Electron Density:
Bulk Density (Electron Density)=5.72 gm/cc note: Specific Gravity of Spriggite =6.98 gm/cc.
Fermion Index:
Fermion Index = 0.05 Boson Index = 0.95
Photoelectric:
PESpriggite =2,083.02 barns/electron U=PESpriggite x relectron=11910.80 barns/cc.
Radioactivity:
GRapi = 4,126,731.93 (Gamma Ray American Petroleum Institute Units)
Concentration of Spriggite per GRapi unit = 242.32 (PPB)
Spriggite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Spriggite - very strong
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 / 6.49 cm
105,787,495
2.86E-03
4,126,731.93
1,356.73
100 gm / 3.01 cm
10,578,750
2.86E-04
412,673.19
135.67
10 gm / 1.40 cm
1,057,875
2.86E-05
41,267.32
13.57
1 gm / 6.49 mm
105,787
2.86E-06
4,126.73
1.36
0.1 gm / 3.01 mm
10,579
2.86E-07
412.67
0.14
0.01 gm / 1.40 mm
1,058
2.86E-08
41.27
0.01
0.001 gm / 0.65 mm
106
2.86E-09
4.13
0.00
Weight of pure Spriggite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.98 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
Spriggite Classification
Dana Class:
05.02.03.01(05)Oxides Containing Uranium and Thorium
(05.02)with a cation charge of 6+ (AO3) and hydrated