Ungursaite Mineral Data

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)

IMA Status:

Discredited IMA 1988

Locality:

Link to MinDat.org Location Data.

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

Color:

Colorless.

Diaphaniety:

Transparent

Hardness:

7 - Quartz

Luster:

Adamantine

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:

r_electron=5.93 gm/cc
note: r_Ungursaite=6.87 gm/cc.

Fermion Index

Fermion Index = 0.00022
Boson Index = 0.99978

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ungursaite is Not Radioactive

Ungursaite Classification

Dana Class:

4.0.0.0 (4)Oxide Minerals

(4.0)Without Dana Classification Numbers

(Oxide, Basic)

Strunz Class:

IV/D.26-50 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.26 - Lithiotantite - Cesplumtantite series

IV/D.26-10 Lithiotantite Li(Ta,Nb)3O8 P 2₁/c 2/m

IV/D.26-20 Natrotantite Na2Ta4O11 R 3-c 3 2/m

IV/D.26-30 Irtyshite Na2(Ta,Nb)4O11 P 6₃/m 6/m

IV/D.26-40 Calciotantite Ca(Ta,Nb)4O11 P 6₃22 6 2 2

IV/D.26-50 Ungursaite NaCa5(Ta,Nb)24O65(OH) P 6₃/m,P 6₃ Hex

IV/D.26-60 Cesplumtantite (Cs,Na,Ca)2(Pb,Sb,Sn)3Ta8O24 Unk Tetra

Other Ungursaite Information

References:

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 - WWW-MINCRYST

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Ungursaite

NaCa5(Ta,Nb)24O65(OH)
Dana No: Unknown Strunz No: IV/D.26-50
Locality:

Notes: