Parsonsite Mineral Data

Parsonsite Mineral Data +

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General Parsonsite Information

Chemical Formula:

Pb2(UO2)(PO4)2·2(H2O)

Composition:

Molecular Weight = 910.40 gm

Uranium 26.15 % U 29.66 % UO₂

Phosphorus 6.80 % P 15.59 % P₂O₅

Hydrogen 0.44 % H 3.96 % H₂O

Lead 45.52 % Pb 49.03 % PbO

Oxygen 21.09 % O

______ ______

100.00 % 98.24 % = TOTAL OXIDE

Empirical Formula:

Pb₂(UO₂)(PO₄)₂·2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1923

Locality:

Kaslol, Shava, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named for Arthur Leonard Parsons (1873-1957), mineralogist, University of Toronto, Canada.

Synonym:

ICSD 89832

PDF 12-259

Parsonsite Image

Images:

Parsonsite

Comments: Bright yellow parsonsite crystals on matrix.
Location: La Chaux, France. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Parsonsite Crystallography

Axial Ratios:

a:b:c =0.6589:1:0.6423

Cell Dimensions:

a = 6.842, b = 10.383, c = 6.67, Z = 2; alpha = 101.26°, beta = 98.174°, gamma = 86.378° V = 459.08 Den(Calc)= 6.59

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.253(1), 3.283(1), 4.233(0.65),

Crystal Structure:

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Burns P C , American Mineralogist , 85 (2000) p.801-805, A new uranyl phosphate chain in the structure of parsonsite

View Additional jPOWD Structure files for Parsonsite
[1]

Physical Properties of Parsonsite

Cleavage:

[010] Indistinct

Color:

Brown, Greenish brown, Yellow, Yellow brown, Light yellow.

Density:

5.72 - 6.29, Average = 6

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Subadamantine

Streak:

white

Optical Properties of Parsonsite

Gladstone-Dale:

CI meas= -0.071 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1335,KPDmeas= 0.1465,KC= 0.1369

Optical Data:

Biaxial (-), a=1.87, g=1.89, bire=0.0200, 2V(Meas)=11-26.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Parsonsite

Electron Density:

r_electron=5.59 gm/cc
note: r_Parsonsite=6.59 gm/cc.

Fermion Index

Fermion Index = 0.10258
Boson Index = 0.89742

Photoelectric:

PE_Parsonsite=1,523.92 barns/electron
U=PE_Parsonsite x r_electron=8,515.96 barns/cc.

Radioactivity:

GRapi = 1,889,796.97 (Gamma Ray American Petroleum Institute Units)

Parsonsite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 16.10 ± 4.02 grams of pure Parsonsite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1609.5 ±402.38 grams of pure Parsonsite .

**Estimated Radioactivity from Parsonsite** - 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 / 6.62 cm	46,800,445	1.26E-03	1,889,796.97	621.30
100 gm / 3.07 cm	4,680,045	1.26E-04	188,979.70	62.13
10 gm / 1.43 cm	468,004	1.26E-05	18,897.97	6.21
1 gm / 6.62 mm	46,800	1.26E-06	1,889.80	0.62
0.1 gm / 3.07 mm	4,680	1.26E-07	188.98	0.06
0.01 gm / 1.43 mm	468	1.26E-08	18.90	0.01
0.001 gm / 0.66 mm	47	1.26E-09	1.89	0.00

Weight of pure Parsonsite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.59 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

Parsonsite Classification

Dana Class:

40.2a.31.1 (40)Hydrated Phosphates, etc

(40.2a)where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++

(40.2a.31)Dana Group

40.2a.31.1 Parsonsite Pb2(UO2)(PO4)2·2(H2O) P1 1

Strunz Class:

VII/E.08-10 VII - Phosphates, Arsenates and Vanadates

VII/E - Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-

VII/E.08 - Parsonsite - Byelorussite-(Ce) series

VII/E.08-10 Parsonsite Pb2(UO2)(PO4)2·2(H2O) P1 1

VII/E.08-20 Hallimondite Pb2(UO2)(AsO4)2 P1 1

VII/E.08-85 Byelorussite-(Ce) NaBa2(Ce,La)2MnTi2Si8O26(F,OH)·(H2O) P 2₁2₁2₁ 2 2 2

Other Parsonsite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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Parsonsite

Pb2(UO2)(PO4)2·2(H2O)
Dana No: 40.2a.31.1 Strunz No: VII/E.08-10
Locality:

Notes: