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Ungursaite (Ungursait)

Additional Functions

Collectors Summary

Color farblos
Lustre Diamantglanz
Hardness (Mohs) 6.75
Crystal System hexagonal, P63, P63/m

Chemism

Chemical formula

Ca(Ta,Nb)4O11

Chemical composition

Calcium, Niob, Tantal, Sauerstoff

Unit weight: 851.822242 u; Number of atoms in the formula: 16

Info

Empirical formula:

Ca(Ta0.75Nb0.25)4O11

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

20.66

11

68.75

15.9994300

175.9937300
Calcium

Ca

4.71

1

6.25

40.0784000

40.0784000
Niobium

Nb

10.91

1

6.25

92.9063820

92.9063820
Tantalum

Ta

63.73

3

18.75

180.9479100

542.8437300

Analysis wt%

Ø Na2O : 0.54, CaO : 5.37, PbO : 0.41, SnO2 : 0.94, Nb2O5 : 4.83, Ta2O5 : 88.52 (Ref: American Mineralogist 86)

Strunz 9th edition incl. updates

4.DJ.05

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
J: Mit großen (± mittelgroßen) [Kationen]; vielgestaltige (polyhedrale) Gerüste
05:Natrotantit-Gruppe

Classification by Hölzel

4.DJ.530

4: OXIDES
D: Dioxides
J: Titanates, Niobates and Tantalates, C large, V medium ò 2
5: Other Niobates, Tantalates

IMA status

diskreditiert 1988

Optical Properties

Color

farblos

Lustre

Diamantglanz

2V angle

Uniaxial

Crystallography

Crystal System

hexagonal

Class (H-M)

6, 6/m

Space Group number

173, 176

Space Group

P63, P63/m

Cell parameters a (Å)

6.218

Cell parameters b (Å)

-

Cell parameters c (Å)

36.80

Cell parameters a/b or c/a

5.918

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

6

Volumne (ų)

1232.196

Physical Properties

Hardness (Mohs)

6.75

Density (g/cm³)

7.23 (berechnet)

6.887 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Kasachstan/Schyghys Qasaqstan oblysy (Ostkasachstan)/Belogorski/Kalba/Irtysh, Fluss/Ungur-Sai Ta-Lagerstätte

Preface

Author (Name, Year)

Voloshin & Pakhomovskiy & Bulgak & Perlina, 1985

References

Mineral. Zhurnal, Kiev (1985): 7(4): 88.

American Mineralogist (1986): 71: 1546 (abs).

Soviet Physics, Crystallography 33 (1988), 498

Strunz Mineralogical Tables 9. Edition (2001), 225.

Other languages

German

Ungursait

English

Ungursaite

Russian

Унгурсаит

Alternative Name

Spanish

Ungursaita