Larisaite Mineral Data

General Larisaite Information

Chemical Formula:

Na(H3O)(UO2)3(SeO3)2O2•4(H2O)

Composition:

Molecular Weight = 1,235.71 gm

Potassium 0.57 % K 0.69 % K₂O

Sodium 1.51 % Na 2.03 % Na₂O

Calcium 0.16 % Ca 0.23 % CaO

Uranium 59.52 % U 67.52 % UO₂

Hydrogen 0.85 % H 7.57 % H₂O

Selenium 12.78 % Se 17.96 % SeO₂

Oxygen 24.61 % O

______ ______

100.00 % 96.00 % = TOTAL OXIDE

Empirical Formula:

Na_0.81K_0.18Ca_0.05(H₃O)_0.73(UO₂)_3.09O₂(SeO₃)₂·4.1(H₂O)

Environment:

In sedimentary rock. Related to haynesite; structure determined

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Repete mine, near Blanding, San Juan County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Larisa Nikolaevna Belova (1923-1998), Russian mineralogist and crystallographer.

Synonym:

IMA2002-061

Larisaite Image

Images:

Larisaite

Comments: Yellow, acicular, radial sprays of greenish yellow larisaite on matrix.
Location: Repete Mine, San Juan County, Utah, USA. Scale: Picture size 1.5 mm.
© Paul M. Schumacher

Larisaite Crystallography

Axial Ratios:

a:b:c =0.4046:1:0.4432

Cell Dimensions:

a = 6.9806, b = 17.249, c = 7.646, Z = 2; beta = 90.039° V = 920.64 Den(Calc)= 4.46

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: Pm

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

By Intensity(I/I_o): 7.67(1)(010), 3.107(0.77)(211), 2.874(0.53)(006,115), 8.63(0.43)(002), 3.85(0.4)(113,020,113), 1.342(0.33)(338,2.2.11), 3.176(0.33)(2

Crystal Structure:

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Chukanov N V , Pushcharovsky D Y , Pasero M , Merlino S , Barinova A V , Mockel S , Pekov I V , Zadov A E , Dubinchuk V T , European Journal of Mineralogy , 16 (2004) p.367-374, Larisaite, Na(H3O)(UO2)3(SeO3)2O2 · 4H2O, a new uranyl selenite mineral, from Repete mine, San Juan County, Utah, U.S.A., Locality: Repete mine, San Juan County, Utah, USA

Physical Properties of Larisaite

Cleavage:

{010} Perfect

Color:

Yellow.

Diaphaneity:

Transparent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Hardness:

1 - Talc

Luster:

Vitreous (Glassy)

Streak:

yellow

Optical Properties of Larisaite

Gladstone-Dale:

CI calc= -0.195 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1601,KC= 0.134
Ncalc = 1.6

Optical Data:

Biaxial (-), a=1.597, b=1.77, g=1.775, bire=0.1780, 2V(Calc)=16, 2V(Meas)=20. Dispersion r < v strong.

Calculated Properties of Larisaite

Electron Density:

Bulk Density (Electron Density)=3.81 gm/cc
note: Specific Gravity of Larisaite =4.46 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Larisaite=1,590.61 barns/electron
U=PE_Larisaite x r_electron=6,063.33 barns/cc.

Radioactivity:

GRapi = 4,336,272.87 (Gamma Ray American Petroleum Institute Units)
Concentration of Larisaite per GRapi unit = 230.61 (PPB)

Larisaite 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) 7.01 ± 1.75 grams of pure Larisaite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 701.45 ±175.36 grams of pure Larisaite .

**Estimated Radioactivity from Larisaite** - 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 / 7.54 cm	106,542,784	2.88E-03	4,336,272.87	1,425.62
100 gm / 3.50 cm	10,654,278	2.88E-04	433,627.29	142.56
10 gm / 1.62 cm	1,065,428	2.88E-05	43,362.73	14.26
1 gm / 7.54 mm	106,543	2.88E-06	4,336.27	1.43
0.1 gm / 3.50 mm	10,654	2.88E-07	433.63	0.14
0.01 gm / 1.62 mm	1,065	2.88E-08	43.36	0.01
0.001 gm / 0.75 mm	107	2.88E-09	4.34	0.00

Weight of pure Larisaite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.46 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

Larisaite Classification

Dana Class:

34.07.07.02 (34)Selenites - Tellurites - Sulfites

(34.07)Dana Type

(34.07.07)Dana Group

34.07.07.01 Haynesite (UO2)3(SeO3)2(OH)2•5(H2O) Pnc2,Pncm Ortho

34.07.07.02 Larisaite! Na(H3O)(UO2)3(SeO3)2O2•4(H2O) Pm 2

Strunz Class:

04.JH.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JH -Selenites without additional anions, with H2O

04.JH.25 Larisaite! Na(H3O)(UO2)3(SeO3)2O2•4(H2O) Pm 2

Other Larisaite Information

References:

NAME( CanMin, 42:1911) PHYS. PROP.(CanMin, 42:1911) OPTIC PROP.(CanMin, 42:1911)

See Also:

Links to other databases for Larisaite :
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
11 - Uranium Minerals

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

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

Larisaite

Na(H3O)(UO2)3(SeO3)2O2•4(H2O)
Dana No: 34.07.07.02 Strunz No: 04.JH.25
Locality:

Notes: