Mineralogy Database

Larisaite Mineral Data

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General Larisaite Information

Help on Chemical  Formula: Chemical Formula: Na(H3O)(UO2)3(SeO3)2O2•4(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na0.81K0.18Ca0.05(H3O)0.73(UO2)3.09O2(SeO3)2�4.1(H2O)
Help on Environment: Environment: In sedimentary rock. Related to haynesite; structure determined
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Repete mine, near Blanding, San Juan County, Utah, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Larisa Nikolaevna Belova (1923-1998), Russian mineralogist and crystallographer.
Help on Synonym: Synonym: IMA2002-061
 

Larisaite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.4046:1:0.4432
Help on Cell Dimensions: Cell Dimensions: a = 6.9806, b = 17.249, c = 7.646, Z = 2; beta = 90.039° V = 920.64 Den(Calc)= 4.46
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: Pm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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
 

Physical Properties of Larisaite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Yellow.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Hardness: Hardness: 1 - Talc
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow
 

Optical Properties of Larisaite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.195 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1601,KC= 0.134
Ncalc = 1.6
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.81 gm/cc
note: Specific Gravity of Larisaite =4.46 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELarisaite =1,590.61 barns/electron
U=PELarisaite x relectron=6,063.33 barns/cc.
Help on Radioactivity: 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
Bequerols
(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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( CanMin, 42:1911) PHYS. PROP.(CanMin, 42:1911) OPTIC PROP.(CanMin, 42:1911)
Help on See Also: 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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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:

 

 
   
 


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