Ungursaite Mineral Data

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General Ungursaite Information

Chemical Formula:

NaCa5(Ta,Nb)24O65(OH)

Composition:

Molecular Weight = 5,094.85 gm

Sodium 0.45 % Na 0.61 % Na₂O

Calcium 3.93 % Ca 5.50 % CaO

Tantalum 63.93 % Ta 78.06 % Ta₂O₅

Niobium 10.94 % Nb 15.65 % Nb₂O₅

Hydrogen 0.02 % H 0.18 % H₂O

Oxygen 20.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCa₅Ta₁₈Nb₆O₆₅(OH)

Environment:

Occurs in the margins of thoreaulite crystals from granitic pegmatite.

IMA Status:

Not Approved IMA 1988 - Published 1985

Locality:

Ungursai, East Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 65336

PDF 15-679

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Ungursaite Crystallography

Axial Ratios:

a:c = 1:5.9183

Cell Dimensions:

a = 6.218, c = 36.8, Z = 1; V = 1,232.20 Den(Calc)= 6.87

Crystal System:

HexagonalSpace Group: P 6₃/m,P 6₃

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

By Intensity(I/I_o): 2.776(1), 3.01(1), 6.16(1),

Physical Properties of Ungursaite

Cleavage:

None

Color:

Colorless.

Diaphaneity:

Transparent

Hardness:

7 - Quartz

Luminescence:

Cathodoluminescence, Short UV=yellow green.

Luster:

Adamantine

Streak:

white

Optical Properties of Ungursaite

Optical Data:

NCalc= 2.19 - from Gladstone-Dale relationship (KC = 0.1731) where Ncalc=Dcalc*KC+1

Calculated Properties of Ungursaite

Electron Density:

Bulk Density (Electron Density)=5.93 gm/cc
note: Specific Gravity of Ungursaite =6.87 gm/cc.

Fermion Index:

Fermion Index = 0.000229327
Boson Index = 0.999770673

Photoelectric:

PE_Ungursaite= 780.76 barns/electron
U=PE_Ungursaite x rElectron Density=4,632.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ungursaite is Not Radioactive

Ungursaite Classification

Dana Class:

04.00.00.00 (04)Oxide Minerals

(04.00)Without Dana Classification Numbers

(04.00.00)Oxide, Basic

04.00.00.00 Ashanite? (Nb,Ta,U,Fe,Mn)4O8 Pcan 2/m 2/m 2/m

04.00.00.00 Chubutite* Pb7O6Cl2 Unk Ortho

04.00.00.00 Clinobirnessite* Na4Mn14O27•9(H2O) Mono

04.00.00.00 Donathite? (Fe,Mg)(Cr,Fe)2O4 P 4/nnm 4/m 2/m 2/m

04.00.00.00 IMA2008-022 UO2(OH)2 pseudo-orthorhombic Mono

04.00.00.00 Krasnogorite* WO3 Pmnb 2/m 2/m 2/m

04.00.00.00 Mengxianminite* (Ca,Na)3(Fe,Mn)2Mg2(Sn,Zn)5Al8O29 Unk Ortho

04.00.00.00 Romanite* (Fe,U,Pb)2(Ti,Fe)O4 Trig ? Trig

04.00.00.00 Tantalowodginite* (Mn2,[])4Ta4Ta8O32 C 2/c 2/m

04.00.00.00 Ungursaite* NaCa5(Ta,Nb)24O65(OH) P 6₃/m,P 6₃ Hex

04.00.00.00 Wolframoixiolite* (Fe,Mn,Nb)(Nb,W,Ta)O4 Pc m

Strunz Class:

04.XX.00 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.X - Unclassified Strunz OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, telluri

04.XX -Oxide, Basic

04.XX.00 Ashanite? (Nb,Ta,U,Fe,Mn)4O8 Pcan 2/m 2/m 2/m

04.XX.00 Methane hydrate-I! 46(H2O)•2(S)•6(L) P m3n 4/m 3 2/m

04.XX.00 Clinobirnessite* Na4Mn14O27•9(H2O) Mono

04.XX.00 Chubutite* Pb7O6Cl2 Unk Ortho

04.XX.00 Kleberite* FeTi6O13•4(H2O)(?) P 6₃mcm ? 6mm

04.XX.00 Hongquiite* TiO F m3m 4/m 3 2/m

04.XX.00 Psilomelane? (Ba,H2O)2Mn5O10 A2/m 2/m

04.XX.00 Struverite? (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m

04.XX.00 Ungursaite* NaCa5(Ta,Nb)24O65(OH) P 6₃/m,P 6₃ Hex

04.XX.00 Uhligite? Ca3(Ti,Al,Zr)9O20 Unk Cubic

04.XX.00 Scheteligite? (Ca,Y,Sb,Mn)2(Ti,Ta,Nb,W)2O6(O,OH) Unk Ortho

04.XX.00 Allendeite! Sc4Zr3O12 R 3 3

04.XX.00 IMA2000-016! (Ti,Fe,Mg,Mn)1-xTi2O5 Pban 2/m 2/m 2/m

04.XX.00 Methane hydrate-II! 136(H2O)•16(S)•8(L) F d3m 4/m 3 2/m

04.XX.00 IMA2000-026! (Mn,Li)4(Ta,Sn)4(Ta,Nb)8O32 C 2/c 2/m

04.XX.00 Methane hydrate-H! 34(H2O)•3(S)•2(M)•1(L) P 6/mmm 6/m 2/m 2/m

Other Ungursaite Information

References:

NAME( AmMin, v71:1546) PHYS. PROP.(Am.Min.,Vol.71,p1546,1986)

See Also:

Links to other databases for Ungursaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info
11 - WWW-MINCRYST

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

Ungursaite

NaCa5(Ta,Nb)24O65(OH)
Dana No: 04.00.00.00 Strunz No: 04.XX.00
Locality:

Notes: