Liandratite Mineral Data

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General Liandratite Information

Chemical Formula:

U++++++(Nb,Ta)2O8

Composition:

Molecular Weight = 578.25 gm

Uranium 41.16 % U 49.46 % UO₃

Tantalum 9.39 % Ta 11.46 % Ta₂O₅

Niobium 27.31 % Nb 39.07 % Nb₂O₅

Oxygen 22.13 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

UNb_1.7Ta_0.3O₈

Environment:

Epitaxial crust on petschekite crystals.

IMA Status:

Approved IMA 1978

Locality:

Antsaoka I pegmatite, Berere region, near Tsaratanana, Madagascar. Link to MinDat.org Location Data.

Name Origin:

Named for Georges Liandrat and his wife, of Samoens, France, who had prospected extensively in Madagascar.

Name Pronunciation:

Liandratite + Pronunciation

Synonym:

ICSD 27779

PDF 13-284

Liandratite Image

Images:

Liandratite

Comments: Yellow crystalline liandratite crust on pegmatite.
Location: Antsakoa I Pegmatite, near Berere, Mahajanga, Madagascar. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Liandratite Crystallography

Axial Ratios:

a:c = 1:0.6305

Cell Dimensions:

a = 6.36, c = 4.01, Z = 1; V = 140.47 Den(Calc)= 6.84

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 31m

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

By Intensity(I/I_o): 3.18(1), 4.01(0.8), 2.49(0.4),

Physical Properties of Liandratite

Cleavage:

None

Color:

Brown, Brownish yellow, Yellow.

Density:

6.8

Diaphaneity:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

yellow

Optical Properties of Liandratite

Gladstone-Dale:

CI meas= 0.323 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.327 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1213,KPDmeas= 0.1221,KC= 0.1804
Ncalc = 2.23

Optical Data:

Isotropic, n=1.83.

Calculated Properties of Liandratite

Electron Density:

Bulk Density (Electron Density)=5.82 gm/cc
note: Specific Gravity of Liandratite =6.80 gm/cc.

Fermion Index:

Fermion Index = 0.0030813005
Boson Index = 0.9969186995

Photoelectric:

PE_Liandratite=1,248.48 barns/electron
U=PE_Liandratite x r_electron=7,270.38 barns/cc.

Radioactivity:

GRapi = 3,004,787.81 (Gamma Ray American Petroleum Institute Units)
Concentration of Liandratite per GRapi unit = 332.80 (PPB)

Liandratite 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) 10.12 ± 2.53 grams of pure Liandratite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1012.3 ±253.07 grams of pure Liandratite .

**Estimated Radioactivity from Liandratite** - 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 / 6.55 cm	73,683,050	1.99E-03	3,004,787.81	987.88
100 gm / 3.04 cm	7,368,305	1.99E-04	300,478.78	98.79
10 gm / 1.41 cm	736,831	1.99E-05	30,047.88	9.88
1 gm / 6.55 mm	73,683	1.99E-06	3,004.79	0.99
0.1 gm / 3.04 mm	7,368	1.99E-07	300.48	0.10
0.01 gm / 1.41 mm	737	1.99E-08	30.05	0.01
0.001 gm / 0.65 mm	74	1.99E-09	3.00	0.00

Weight of pure Liandratite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.80 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

Liandratite Classification

Dana Class:

08.01.09.01 (08)Multiple Oxides with Nb, Ta, and Ti

(08.01)where A BO4

(08.01.09)Dana Group

08.01.09.01 Liandratite U(Nb,Ta)2O8 P 31m 3 2/m

08.01.09.02 Petscheckite UFe(Nb,Ta)2O8 P 31m 3 2/m

Strunz Class:

04.DH.35 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DH -With large (± medium-sized) cations; sheets of edge-sharing octahedra

04.DH.35 Liandratite U(Nb,Ta)2O8 P 31m 3 2/m

04.DH.35 Petscheckite UFe(Nb,Ta)2O8 P 31m 3 2/m

Other Liandratite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

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

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Liandratite

U++++++(Nb,Ta)2O8
Dana No: 08.01.09.01 Strunz No: 04.DH.35
Locality:

Notes: