Mineralogy Database

Liandratite Mineral Data

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General Liandratite Information

Help on Chemical  Formula: Chemical Formula: U++++++(Nb,Ta)2O8
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: UNb1.7Ta0.3O8
Help on Environment: Environment: Epitaxial crust on petschekite crystals.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Antsaoka I pegmatite, Berere region, near Tsaratanana, Madagascar. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Georges Liandrat and his wife, of Samoens, France, who had prospected extensively in Madagascar.
Help on Name Pronunciation: Name Pronunciation: Liandratite + Pronunciation Say LIANDRATITE
Help on Synonym: Synonym: ICSD 27779
  PDF 13-284

Liandratite Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:0.6305
Help on Cell Dimensions: Cell Dimensions: a = 6.36, c = 4.01, Z = 1; V = 140.47 Den(Calc)= 6.84
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 31m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.18(1), 4.01(0.8), 2.49(0.4),

Physical Properties of Liandratite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Brownish yellow, Yellow.
Help on Density: Density: 6.8
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow

Optical Properties of Liandratite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Isotropic, n=1.83.

Calculated Properties of Liandratite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.82 gm/cc
note: Specific Gravity of Liandratite =6.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0030813005
Boson Index = 0.9969186995
Help on Photoelectric: Photoelectric: PELiandratite =1,248.48 barns/electron
U=PELiandratite x relectron=7,270.38 barns/cc.
Help on Radioactivity: 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
Curies (Ci)
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

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.01)where A BO4
  (08.01.09)Dana Group Liandratite U(Nb,Ta)2O8 P 31m 3 2/m Petscheckite UFe(Nb,Ta)2O8 P 31m 3 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 04.DH.35





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