Ianthinite Mineral Data

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:

From the Greek ianthinos, "violet."

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),

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Forms: [ 2 0 1] [ 2 3 0] [ 2 0 3] [ 0 1 1] [ 0 0 1]

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Physical Properties of Ianthinite

Cleavage:

[100] Perfect

Color:

Violet black, Violet, Violet purple.

Density:

5.16

Diaphaniety:

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

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:

r_electron=4.34 gm/cc
note: r_Ianthinite=5.24 gm/cc.

Fermion Index

Fermion Index = 0.00573
Boson Index = 0.99427

Photoelectric:

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

Radioactivity:

GRapi = 5,530,896.80 (Gamma Ray American Petroleum Institute Units)

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	140,135,627	3.79E-03	5,530,896.80	1,818.38
100 gm / 3.32 cm	14,013,563	3.79E-04	553,089.68	181.84
10 gm / 1.54 cm	1,401,356	3.79E-05	55,308.97	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:

5.6.1.1 (5)Oxides Containing Uranium and Thorium

(5.6)with polyvalent uranium

(5.6.1)Dana Group

5.6.1.1 Ianthinite (UO2)·5(UO3)·10(H2O) P 2₁cn mm2

Strunz Class:

IV/H.01-10 IV - Oxides

IV/H - Uranyl ([UO2]2+) hydroxides and hydrates

IV/H.01 - Ianthinite - Paraschoepite series

IV/H.01-10 Ianthinite (UO2)·5(UO3)·10(H2O) P 2₁cn mm2

IV/H.01-20 Studtite [(UO2)O2(H2O)2](H2O)2 C 2/m 2/m

IV/H.01-30 Metastudtite UO4·2(H2O) I mmm 2/m 2/m 2/m

IV/H.01-40 Schoepite (UO2)8O2(OH)12·12(H2O) P 2₁ca mm2

IV/H.01-50 Metaschoepite UO3·n(H2O)(n<2) Pbna 2/m 2/m 2/m

IV/H.01-60 Paraschoepite UO3·2(H2O)(?) P bca 2/m 2/m 2/m

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Uranium Minerals 13 -École des Mines de Paris

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

Ianthinite

(UO2)·5(UO3)·10(H2O)
Dana No: 5.6.1.1 Strunz No: IV/H.01-10
Locality:

Notes: