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Ungursaite

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 )

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.

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Irtyshite

Na2(Ta,Nb)4O11

hexagonal : 6/m, 6 : P63/m, P63

4.DJ.05

'Ungursaite'

Ca(Ta,Nb)4O11

hexagonal : 6, 6/m : P63, P63/m

4.DJ.05

Natrotantite

Na2Ta4O11

trigonal : 3m : R3c

4.DJ.05

Calciotantite

CaTa4O11

hexagonal : 622 : P6322

4.DJ.05

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Irtyshite

Na2(Ta,Nb)4O11

hexagonal : 6/m, 6 : P63/m, P63

4.DJ.500

Cesplumtantite

(Cs,Na)2(Pb,Sb3+)3Ta8O24

4.DJ.510

'Ungursaite'

Ca(Ta,Nb)4O11

hexagonal : 6, 6/m : P63, P63/m

4.DJ.530

Calciotantite

CaTa4O11

hexagonal : 622 : P6322

4.DJ.540

Petscheckite

U4+Fe2+Nb2O8

trigonal : 3m : P31m

4.DJ.560

Liandratite

U6+(Nb,Ta)2O8

trigonal : 3m : P31m

4.DJ.570

Murataite-(Y)

(Y,Na)6(Zn,Fe3+)5(Ti,Nb)12(O,F,OH)43

kubisch : 43m : F43m

4.DJ.580

Changbaiite

PbNb2O6

trigonal : 3m : R3m

4.DJ.590

Alternative Name

Spanish

Ungursaita

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Ungursait
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English pages

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Russian pages

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