Ursilite Mineral Data

Ursilite Mineral Data

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General Ursilite Information

Chemical Formula:

(Mg,Ca)4[(UO2)4(OH)5/(Si2O5)5.5]·13(H2O)

Composition:

Molecular Weight = 2,261.26 gm

Calcium 1.77 % Ca 2.48 % CaO

Magnesium 3.22 % Mg 5.35 % MgO

Uranium 42.11 % U 47.77 % UO₂

Silicon 13.66 % Si 29.23 % SiO₂

Hydrogen 1.38 % H 12.35 % H₂O

Oxygen 37.85 % O

______ ______

100.00 % 97.17 % = TOTAL OXIDE

Empirical Formula:

Mg₃Ca(UO₂)₄(OH)₅(Si₂O₅)_5.5·13(H₂O)

IMA Status:

Not Approved IMA

Locality:

Link to MinDat.org Location Data.

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Ursilite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

Physical Properties of Ursilite

Color:

Lemon.

Density:

3.18

Hardness:

2-3 - Gypsum-Calcite

Streak:

light yellow

Optical Properties of Ursilite

Optical Data:

NCalc= 1.53 - from Gladstone-Dale relationship (KC = 0.1664) where Ncalc=Dmeas*KC+1

Calculated Properties of Ursilite

Electron Density:

r_electron=2.92 gm/cc
note: r_Ursilite=3.18 gm/cc.

Fermion Index

Fermion Index = 0.01284
Boson Index = 0.98716

Photoelectric:

PE_Ursilite=1,042.45 barns/electron
U=PE_Ursilite x r_electron=3,040.45 barns/cc.

Radioactivity:

GRapi = 3,291,772.14 (Gamma Ray American Petroleum Institute Units)

Ursilite 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) 9.24 ± 2.31 grams of pure Ursilite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 924.02 ±231.01 grams of pure Ursilite .

**Estimated Radioactivity from Ursilite** - 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 / 8.44 cm	75,368,791	2.04E-03	3,291,772.14	1,082.23
100 gm / 3.92 cm	7,536,879	2.04E-04	329,177.21	108.22
10 gm / 1.82 cm	753,688	2.04E-05	32,917.72	10.82
1 gm / 8.44 mm	75,369	2.04E-06	3,291.77	1.08
0.1 gm / 3.92 mm	7,537	2.04E-07	329.18	0.11
0.01 gm / 1.82 mm	754	2.04E-08	32.92	0.01
0.001 gm / 0.84 mm	75	2.04E-09	3.29	0.00

Weight of pure Ursilite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.18 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

Ursilite Classification

Dana Class:

51.0.0.0 (51)Nesosilicate Minerals

(51.0)Without Dana Classification Numbers

(Uranyl nesosilicate)

Strunz Class:

VIII/B.37-10 VIII - Silicates

VIII/B - Nesosub-silicates. "Insel" silicates with anions unfamiliar to tetraheders. Uranyl-"Insel" silicates with [UO2]2+ - [SiO4]4-

VIII/B.37 - Ursilite - Metahaiweeite series

VIII/B.37-10 Ursilite (Mg,Ca)4[(UO2)4(OH)5/(Si2O5)5.5]·13(H2O) Unk Ortho

VIII/B.37-20 Haiweeite Ca[(UO2)2Si5O12(OH)2]·3(H2O) C mcm 2/m 2/m 2/m

VIII/B.37-30 Metahaiweeite Ca(UO2)2Si6O15·n(H2O),n<5 P 2/c ? 2/m

Other Ursilite Information

References:

PHYS. PROP.(Enc. of Minerals,1st ed.,1974)

See Also:

Links to other databases for Ursilite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - Uranium Minerals 12 -École des Mines de Paris

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Ursilite

(Mg,Ca)4[(UO2)4(OH)5/(Si2O5)5.5]·13(H2O)
Dana No: Unknown Strunz No: VIII/B.37-10
Locality:

Notes: