Uramarsite Mineral Data

General Uramarsite Information

Chemical Formula:

(NH4,H3O)2(UO2)2(AsO4,PO4)2•6H2O

Composition:

Molecular Weight = 935.42 gm

Sodium 0.22 % Na 0.30 % Na₂O

Uranium 51.40 % U 58.31 % UO₂

Arsenic 9.77 % As 14.99 % As₂O₅

Phosphorus 2.58 % P 5.92 % P₂O₅

Hydrogen 0.50 % H - % Calc as (NH₄)₂O

Hydrogen 1.55 % H 13.83 % H₂O

Nitrogen 1.72 % N 3.20 % (NH₄)₂O

Oxygen 32.26 % O

______ ______

100.00 % 96.54 % = TOTAL OXIDE

Empirical Formula:

(NH₄)_1.15(H₃O)_0.72(Na)_0.09(UO₂)_2.022(As)_0.612(P)_0.39

Environment:

Discovered in the supergene zone of the Bota-Burum U-Mo deposit. Meta-autunite group. Arsenate analog of uramphite.

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Bota-Burum uranium deposit, Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for its composition of uranium, ammonium, and arsenic.

Synonym:

IMA2005-043

Uramarsite Image

Images:

Uramarsite

Comments: Brownish green cleavage fragment or uramarsite, co-type material.
Location: Bota-Burum Uranium deposit, Kazakhstan. Scale: See Image.
© Rruff Database

Uramarsite Crystallography

Axial Ratios:

a:c = 1:1.2726

Cell Dimensions:

a = 7.19, c = 9.15, Z = 1; V = 473.02 Den(Calc)= 3.28

Crystal System:

Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mmm

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

By Intensity(I/I_o): 9.27(1), 4.85(0.25), 2.28(0.2),3.86(0.2), 2.8(0.13), 1.823(0.08), 1.713(0.07), 2.076(0.06),

Physical Properties of Uramarsite

Cleavage:

{001} Perfect, {010} Imperfect

Color:

Pale green.

Density:

3.22

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

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

Hardness:

2.5 - Finger Nail

Luminescence:

Fluorescent and radioactive, Short UV=green, Long UV=green.

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Uramarsite

Gladstone-Dale:

CI meas= -0.283 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.26 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1776,KPDmeas= 0.181,KC= 0.141
Ncalc = 1.45 - 1.46

Optical Data:

Biaxial (-), a=1.562, b=1.593, g=1.593, bire=0.0310, 2V(Calc)=0, 2V(Meas)=< 5. Dispersion no dispersion.

Calculated Properties of Uramarsite

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Uramarsite =3.28 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Uramarsite=1,316.28 barns/electron
U=PE_Uramarsite x r_electron=3,846.36 barns/cc.

Radioactivity:

GRapi = 3,903,333.92 (Gamma Ray American Petroleum Institute Units)
Concentration of Uramarsite per GRapi unit = 256.19 (PPB)

Uramarsite 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) 7.79 ± 1.95 grams of pure Uramarsite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 779.25 ±194.81 grams of pure Uramarsite .

**Estimated Radioactivity from Uramarsite** - 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 / 8.35 cm	92,008,557	2.49E-03	3,903,333.92	1,283.29
100 gm / 3.88 cm	9,200,856	2.49E-04	390,333.39	128.33
10 gm / 1.80 cm	920,086	2.49E-05	39,033.34	12.83
1 gm / 8.35 mm	92,009	2.49E-06	3,903.33	1.28
0.1 gm / 3.88 mm	9,201	2.49E-07	390.33	0.13
0.01 gm / 1.80 mm	920	2.49E-08	39.03	0.01
0.001 gm / 0.84 mm	92	2.49E-09	3.90	0.00

Weight of pure Uramarsite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.28 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

Uramarsite Classification

Dana Class:

40.02a.07.02 (40)Hydrated Phosphates, etc

(40.02a)where A++ (B++)2 (XO4) ï¿½ x(H2O), containing (UO2)++

(40.02a.07)Dana Group

40.02a.07.01 Uramphite (NH4)(UO2)(PO4)•3(H2O) P 4/nmm 4/m 2/m 2/m

40.02a.07.02 Uramarsite! (NH4,H3O)2(UO2)2(AsO4,PO4)2•6H2O P 4/mmm 4/m 2/m 2/m

Strunz Class:

08.EB.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.E - Uranyl Phosphates and Arsenates

08.EB -UO2:RO4 = 1:1

08.EB.15 Abernathyite K(UO2)(AsO4)•4(H2O) P 4/ncc 4/m 2/m 2/m

08.EB.15 Chernikovite (H3O)2(UO2)2(PO4)2•6(H2O) P 4/nmm 4/m 2/m 2/m

08.EB.15 Meta-ankoleite K2(UO2)2(PO4)2•6(H2O) P 4/nmm 4/m 2/m 2/m

08.EB.15 Natrouranospinite (Na2,Ca)(UO2)2(AsO4)2•5(H2O) P 4/nmm 4/m 2/m 2/m

08.EB.15 Uramphite (NH4)(UO2)(PO4)•3(H2O) P 4/nmm 4/m 2/m 2/m

08.EB.15 Trogerite H2(UO2)2(AsO4)2•8(H2O) P 4/mmm 4/m 2/m 2/m

08.EB.15 Uramarsite! (NH4,H3O)2(UO2)2(AsO4,PO4)2•6H2O P 4/mmm 4/m 2/m 2/m

Other Uramarsite Information

References:

NAME( AmMin, v94:205) PHYS. PROP.(AmMin, v94:205) OPTIC PROP.(AmMin, v94:205)

See Also:

Links to other databases for Uramarsite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Uramarsite

(NH4,H3O)2(UO2)2(AsO4,PO4)2•6H2O
Dana No: 40.02a.07.02 Strunz No: 08.EB.15
Locality:

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