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Locock A J , Kinman W S , Burns P C , The Canadian Mineralogist , 43 (2005) p.989-1003, The structure and composition of uranospathite,, Al1-xVacancyx[(UO2)(PO4)]2(H2O)20+3xF1-3x, x = 0 - 0.33,, a non-centrosymmetric flourine-bearing mineral of the autunite group,, and of a related synthetic lower hydrate,, Al0.67Vacancy0.33[(UO2)(PO4)]2(H2O)15.5, Locality: Venachat, Haute-Vienne, France
Physical Properties of Uranospathite
Cleavage:
{001} Perfect, {100} Good, {010} Indistinct
Color:
Bluish green, Yellow, Light green.
Density:
2.5
Habit:
Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Hardness:
2.5 - Finger Nail
Luminescence:
Fluorescent, Long UV=yellow green.
Streak:
yellow white
Optical Properties of Uranospathite
Gladstone-Dale:
CI meas= -0.068 (Fair) - where the CI = (1-KPDmeas/KC) CI calc= -0.056 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2008,KPDmeas= 0.2032,KC= 0.1902 Ncalc = 1.48
Estimated Radioactivity from Uranospathite - 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 / 9.11 cm
75,391,078
2.04E-03
3,366,772.45
1,106.88
100 gm / 4.23 cm
7,539,108
2.04E-04
336,677.24
110.69
10 gm / 1.96 cm
753,911
2.04E-05
33,667.72
11.07
1 gm / 9.11 mm
75,391
2.04E-06
3,366.77
1.11
0.1 gm / 4.23 mm
7,539
2.04E-07
336.68
0.11
0.01 gm / 1.96 mm
754
2.04E-08
33.67
0.01
0.001 gm / 0.91 mm
75
2.04E-09
3.37
0.00
Weight of pure Uranospathite in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.53 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