Uramarsite Mineral Data

Advertisment

Excalibur Mineral Corp. 1885 Seminole Trail - Suite 202 Charlottesville, VA 22901-1160 USA

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 DipyramidalH-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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Rastsvetaeva R K , Sidorenko G A , Ivanova A G , Chukanov N V , Crystallography Reports , 53 (2008) p.771-774, Structural model of uramarsite, Locality: South Kazakhstan

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 Becquerels (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) · 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

Search for Uramarsite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Uramarsite :

A Bijoux Google Search for Uramarsite
Adam's Minerals Google Search for Uramarsite
Cape Minerals Google Search for Uramarsite
Dakota Matrix Minerals Google Search for Uramarsite
Excalibur Mineral Corp. Google Search for Uramarsite
Exceptional Minerals Google Search for Uramarsite
John Betts Fine Minerals Search for Uramarsite
McDougall Minerals Google Search for Uramarsite
Mineral News Website Link
Rock and Mineral Shows Google Search for Uramarsite
Weinrich Minerals, Inc. Google Search for Uramarsite

Ask about Uramarsite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Uramarsite Specimen Label here :

Uramarsite

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

Notes: