Liandratite
A valid IMA mineral species
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About Liandratite
Formula:
U(Nb,Ta)2O8
Colour:
Yellow to yellow-brown
Hardness:
3½
Specific Gravity:
7.0
Crystal System:
Trigonal
Name:
Named in honor of Georges Liandrat, French professor from Samoëns, France, for his noteworthy prospecting activities in Madagascar.
Unique Identifiers
Mindat ID:
2391
Long-form identifier:
mindat:1:1:2391:3
GUID
(UUID V4):
(UUID V4):
8b8a37b7-8d17-401b-8452-1c2a1f08ae56
IMA Classification of Liandratite
Approved
IMA Formula:
U6+Nb2O8
Approval year:
1975
Classification of Liandratite
4.DH.35
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
H : With large (+- medium-sized) cations; sheets of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
H : With large (+- medium-sized) cations; sheets of edge-sharing octahedra
8.1.9.1
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
18.3.1
18 : Niobates and Tantalates
3 : Niobates and tantalates containing U but not rare earths
18 : Niobates and Tantalates
3 : Niobates and tantalates containing U but not rare earths
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Lia | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Liandratite
Transparency:
Translucent
Comment:
Described as glassy
Colour:
Yellow to yellow-brown
Streak:
Yellow-white
Hardness:
3½ on Mohs scale
Fracture:
Conchoidal
Density:
7.0 g/cm3 (Measured) 6.87 g/cm3 (Calculated)
Comment:
Measured after heating
Optical Data of Liandratite
Type:
Isotropic
RI values:
n = 1.83
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High
Chemistry of Liandratite
Mindat Formula:
U(Nb,Ta)2O8
Elements listed:
Crystallography of Liandratite
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3 1m
Setting:
P3 1m
Cell Parameters:
a = 6.36 Å, c = 4.01 Å
Ratio:
a:c = 1 : 0.631
Unit Cell V:
140.47 Ă
Âł (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.18 Ă | (10) |
4.01 Ă | (8) |
2.49 Ă | (4) |
1.838 Ă | (3) |
1.692 Ă | (2) |
1.200 Ă | (2) |
2.00 Ă | (1) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites | |
Stage 7: Great Oxidation Event | <2.4 |
47f : [Uranyl (Uâ¶âș) minerals] | |
47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Liandratite
General Appearance of Type Material:
As a 2mm thick metamict crust surrounding petscheckite
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 14561
Geological Setting of Type Material:
A beryl-columbite subtype LCT granite pegmatite
Associated Minerals at Type Locality:
Reference:
MĂŒcke, A., Strunz, H. (1978) Petscheckite and liandratite, two new pegmatite minerals from Madagascar. American Mineralogist: 63: 941-946.
Synonyms of Liandratite
Other Language Names for Liandratite
German:Liandradit
Liandratit
Liandratit
Spanish:Liandradita
Liandratita
Liandratita
Common Associates
Associated Minerals Based on Photo Data:
6 photos of Liandratite associated with Petscheckite | UFe(Nb,Ta)2O8 |
3 photos of Liandratite associated with Columbite-(Fe)-Columbite-(Mn) Series | |
1 photo of Liandratite associated with Fergusonite-(Y) | YNbO4 |
Related Minerals - Strunz-mindat Grouping
4.DH. | Fluornatropyrochlore | (Na,Pb,Ca,REE,U)2Nb2O6F |
4.DH. | Roméite Group | A2(Sb5+)2O6Z |
4.DH. | Hydroxykenomicrolite | (â»,Na,Sb3+)2Ta2O6(OH) |
4.DH. | Fluornatroroméite | (Na,Ca)2Sb2(O,OH)6F |
4.DH. | Oxyplumboroméite | Pb2Sb2O6O |
4.DH. | Cesiokenopyrochlore | â»Nb2(O,OH)6(Cs,â») |
4.DH. | Oxyyttrobetafite-(Y) | Y2Ti2O6O |
4.DH.05 | Brannerite | UTi2O6 |
4.DH.05 | Orthobrannerite | U4+U6+Ti4O12(OH)2 |
4.DH.05 | Thorutite | (Th,U,Ca)Ti2(O,OH)6 |
4.DH.10 | Kassite | CaTi2O4(OH)2 |
4.DH.10 | Lucasite-(Ce) | CeTi2(O,OH)6 |
4.DH.15 va | Alumotungstite | â»2W2O6(H2O) |
4.DH.15 | Bismutomicrolite (of Hogarth 1977) | |
4.DH.15 | Hydroplumboelsmoreite | (Pb,â»)(W,Fe3+)2O6 · H2O |
4.DH.15 | Hydropyrochlore | (H2O,â»)2Nb2(O,OH)6(H2O) |
4.DH.15 | Plumbomicrolite (of Hogarth 1977) | |
4.DH.15 | Stibiomicrolite (of Groat et al.) | |
4.DH.15 | Strontiopyrochlore (of Hogarth 1977) | A2Nb2(O,OH)6Z |
4.DH.15 | Fluornatromicrolite | (Na1.5Bi0.5)Ta2O6F |
4.DH.15 | Bismutopyrochlore (of Chukanov et al.) | (Bi,Ca,U,Pb)2-xNb2(O,OH)6(OH) |
4.DH.15 | Hydrokenoelsmoreite | â»2W2O6(H2O) |
4.DH.15 | Fluorcalciomicrolite | (Ca,Na)2(Ta,Nb)2O6F |
4.DH.15 | Oxycalciobetafite | Ca2(Ti,Nb)2O6O |
4.DH.15 va | Yttromicrolite (of Hogarth) | (Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7 |
4.DH.15 | Oxynatropyrochlore | (Na,Ca,U)2Nb2O6(O,OH) |
4.DH.15 | Hydroxycalciopyrochlore | (Ca,Na,U,â»)2(Nb,Ti)2O6(OH) |
4.DH.15 | Fluorcalciopyrochlore | (Ca,Na)2(Nb, Ti)2O6F |
4.DH.15 | Oxycalciopyrochlore | Ca2Nb2O6O |
4.DH.15 | Fluorstrontiopyrochlore | (Sr,â»)2Nb2(O,OH)6F |
4.DH.15 | Oxyplumbopyrochlore | Pb2Nb2O6O |
4.DH.15 | Kenoplumbopyrochlore | (Pb,â»)Nb2O6(â»,O) |
4.DH.15 | Oxyyttropyrochlore-(Y) | (Y,â»)2Nb2O6O |
4.DH.15 | Fluorkenopyrochlore | (â»,Sr,Ce,Ca,Na)2(Nb,Ti)2O6F |
4.DH.15 | Oxyuranobetafite | (U,Ca,â»)2(Ti,Nb)2O6O |
4.DH.15 | Oxycalciomicrolite | Ca2Ta2O6O |
4.DH.15 | Oxystannomicrolite | Sn2Ta2O6O |
4.DH.15 | Kenoplumbomicrolite | (Pb,â»)2Ta2O6(â»,OH,O) |
4.DH.15 | Oxystibiomicrolite | (Sb3+,Ca)2Ta2O6O |
4.DH.15 | Hydromicrolite | (H2O,â»)2Ta2(O,OH)6(H2O) |
4.DH.15 | Hydrokenomicrolite | (â»,H2O)2Ta2(O,OH)6(H2O) |
4.DH.15 | Hydroxymanganopyrochlore | (Mn2+,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) |
4.DH.15 | Hydroxycalciomicrolite | Ca1.5Ta2O6(OH) |
4.DH.15 | Fluorplumbopyrochlore | (Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6F |
4.DH.15 | Hydroxyplumbopyrochlore | (Pb1.5â»0.5)Nb2O6(OH) |
4.DH.15 | Oxynatromicrolite | (Na,Ca,U)2(Ta,Nb)2O6(O,F) |
4.DH.15 | Fluorhydropyrochlore | |
4.DH.15 | Hydroxykenoelsmoreite | (â»,Pb)2(W,Fe3+,Al)2(O,OH)6(OH) |
4.DH.15 | Hydrokenopyrochlore | (â»,x)2Nb2O6(H2O,Cs) |
4.DH.15 | Hydroxykenopyrochlore | (â»,Ce,Ba)2(Nb,Ti)2O6(OH,F) |
4.DH.15 | Hydroxynatropyrochlore | (Na,Ca,Ce)2Nb2O6(OH) |
4.DH.15 | Hydroxynatromicrolite | (Na,Bi3+,â»)2Ta2O6(OH) |
4.DH.15 | Unnamed (Sb-analogue of Hydroxymanganopyrochlor) | (Mn,Ca,Y)2(Sb,Ti)2O6(OH) |
4.DH.15 | Oxybismutomicrolite | (Bi1.33â»0.67)ÎŁ2Ta2O6O |
4.DH.20 | Bindheimite | Pb2Sb2O6O |
4.DH.20 | Hydroxycalcioroméite | (Ca,Sb3+)2(Sb5+,Ti)2O6(OH) |
4.DH.20 | Monimolite | Pb2Sb5+2O7 |
4.DH.20 | Cuproroméite | Cu2Sb2(O,OH)7 |
4.DH.20 | Stetefeldtite | Ag2Sb2(O,OH)7 |
4.DH.20 | Stibiconite | Sb3+Sb5+2O6(OH) |
4.DH.20 | FluorcalcioromĂ©ite | (Ca,Na,â»)2Sb5+2(O,OH)6F |
4.DH.20 | OxycalcioromeÌite | Ca2Sb2O6O |
4.DH.20 | HydroxyferroromĂ©ite | (Fe2+1.5â»0.5)Sb5+2O6(OH) |
4.DH.25 | Rosiaite | PbSb5+2O6 |
4.DH.30 | Zirconolite | CaZrTi2O7 |
4.DH.30 | Laachite | (Ca,Mn)2Zr2Nb2TiFeO14 |
4.DH.30 | Nöggerathite-(Ce) | (Ce,Ca)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14 |
4.DH.30 | Stefanweissite | (Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14 |
4.DH.35 | Petscheckite | UFe(Nb,Ta)2O8 |
4.DH.40 | Ingersonite | Ca3Mn2+Sb5+4O14 |
4.DH.45 | Pittongite | Na0.22(W,Fe3+)(O,OH)3 · 0.44H2O |
4.DH.50 | Tazzoliite | Ba4-xNaxTi2Nb3SiO17[PO2(OH)2]x(OH)(1-2x) |
Other Information
Notes:
radioactive
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Liandratite
mindat.org URL:
https://www.mindat.org/min-2391.html
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References for Liandratite
Localities for Liandratite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Argentina | |
| Galliski et al. (2009) +1 other reference |
Australia | |
| R Bottrill collection (unconfirmed) |
Canada | |
| WSP (2017) |
Egypt | |
| El-Naby (2009) |
Helmy | |
| 52 (2) +1 other reference |
Madagascar (TL) | |
| MĂŒcke et al. (1978) |
Norway | |
| Rune S. Selbekk (2010) |
| Kristiansen (2006) |
| Larsen. A.O. & Ă sheim (2008) |
Poland | |
| Matyszczak (2018) |
Matyszczak (2018) | |
Matyszczak (2018) | |
| Matyszczak (2018) |
| Matyszczak (2018) |
Matyszczak (2018) | |
| Matyszczak (2018) |
| Matyszczak (2018) |
| Matyszczak (2018) |
Sweden | |
| Pavel.M. Kartashov (n.d.) |
USA | |
| FĂ€rber (n.d.) |
| Personal collection of Fred E Davis |
| Cordura |
www.uwrf.edu/~wc01 |
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Mica Lode Mine, Eight Mile Park Pegmatite Mining District, Fremont County, Colorado, USA