Ianthinite Mineral Data

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General Ianthinite Information

Chemical Formula:

(UO2)•5(UO3)•10(H2O)

Composition:

Molecular Weight = 304.04 gm

Uranium 78.29 % U 94.07 % UO₃

Hydrogen 0.66 % H 5.93 % H₂O

Oxygen 21.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

UO₂(OH)₂

Environment:

Sedimentary uranium deposits.

IMA Status:

Valid Species (Pre-IMA) 1924

Locality:

Kasolo, Belgian Congo. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek ianthinos, "violet."

Name Pronunciation:

Ianthinite + Pronunciation

Synonym:

ICSD 84442

PDF 12-272

Ianthinite Image

Images:

Ianthinite Schoepite

Comments: Purple to brown resinous ianthinite with yellow schoepite and orange becquerelite.
Location: Colorado Plateau area, Saguache County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ianthinite Crystallography

Axial Ratios:

a:b:c =0.6256:1:2.6488

Cell Dimensions:

a = 7.178, b = 11.473, c = 30.39, Z = 26; V = 2,502.71 Den(Calc)= 5.24

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P 2₁cn

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

By Intensity(I/I_o): 7.63(1), 3.24(0.8), 3.81(0.8),

Forms:

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Forms: ( 2 0 1) ( 2 3 0) ( 2 0 3) ( 0 1 1) ( 0 0 1)

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Crystal Structure:

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Burns P C , Finch R J , Hawthorne F C , Miller M L , Ewing R C , Journal of Nuclear Materials , 249 (1997) p.199-206, The crystal structure of ianthinite, [U4+2(UO2)4O6(OH)4](H2O)5: a possible, phase for Pu4+ incorporation during the oxidation of spent nuclear fuel, Locality: Shinkolobwe mine, Shaba, southern Congo

Physical Properties of Ianthinite

Cleavage:

{100} Perfect

Color:

Violet black, Violet, Violet purple.

Density:

5.16

Diaphaneity:

Transparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Sub Metallic

Streak:

violet brown

Optical Properties of Ianthinite

Gladstone-Dale:

CI meas= -0.228 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.21 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1587,KPDmeas= 0.1611,KC= 0.1312
Ncalc = 1.68 - 1.69

Optical Data:

Biaxial (-), a=1.674, b=1.9, g=1.92, bire=0.2460, 2V(Calc)=30, 2V(Meas)=58.

Pleochroism (x):

colorless.

Pleochroism (y):

violet.

Pleochroism (z):

dark violet.

Calculated Properties of Ianthinite

Electron Density:

Bulk Density (Electron Density)=4.34 gm/cc
note: Specific Gravity of Ianthinite =5.24 gm/cc.

Fermion Index:

Fermion Index = 0.0057387701
Boson Index = 0.9942612299

Photoelectric:

PE_Ianthinite=2,142.97 barns/electron
U=PE_Ianthinite x r_electron=9,307.09 barns/cc.

Radioactivity:

GRapi = 5,530,898.91 (Gamma Ray American Petroleum Institute Units)
Concentration of Ianthinite per GRapi unit = 180.80 (PPB)

Ianthinite 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) 5.50 ± 1.37 grams of pure Ianthinite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 549.94 ±137.49 grams of pure Ianthinite .

**Estimated Radioactivity from Ianthinite** - 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 / 7.14 cm	140,135,639	3.79E-03	5,530,898.91	1,818.38
100 gm / 3.32 cm	14,013,564	3.79E-04	553,089.89	181.84
10 gm / 1.54 cm	1,401,356	3.79E-05	55,308.99	18.18
1 gm / 7.14 mm	140,136	3.79E-06	5,530.90	1.82
0.1 gm / 3.32 mm	14,014	3.79E-07	553.09	0.18
0.01 gm / 1.54 mm	1,401	3.79E-08	55.31	0.02
0.001 gm / 0.71 mm	140	3.79E-09	5.53	0.00

Weight of pure Ianthinite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.24 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

Ianthinite Classification

Dana Class:

05.06.01.01 (05)Oxides Containing Uranium and Thorium

(05.06)with polyvalent uranium

(05.06.01)Dana Group

05.06.01.01 Ianthinite (UO2)•5(UO3)•10(H2O) P 2₁cn mm2

Strunz Class:

04.GA.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.G - Uranyl Hydroxides

04.GA -Without additional cations

04.GA.10 Ianthinite (UO2)•5(UO3)•10(H2O) P 2₁cn mm2

Other Ianthinite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Ianthinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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

Ianthinite

(UO2)•5(UO3)•10(H2O)
Dana No: 05.06.01.01 Strunz No: 04.GA.10
Locality:

Notes: