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Fluorcalciomicrolite (Fluorcalciomikrolith)

Collectors Summary

Crystal System kubisch, Fd3m

Chemism

Chemical formula

(Ca,Na)2Ta2(O,OH)6F

Additional chem. information

Pyrochlore Supergruppe

Chemical composition

Calcium, Natrium, Tantal, Fluor, Sauerstoff, Wasserstoff

Unit weight: 550.01520885 u; Number of atoms in the formula: 12.5

Info

Empirical formula:

(Ca0.75Na0.25)2Ta2(O0.75(OH)0.25)6F

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.27

1.5

12.00

1.0079470

1.5119205

Oxygen

O

17.45

6

48.00

15.9994300

95.9965800

Fluorine

F

3.45

1

8.00

18.9984033

18.9984033

Sodium

Na

2.09

0.5

4.00

22.9897702

11.4948851

Calcium

Ca

10.93

1.5

12.00

40.0784000

60.1176000

Tantalum

Ta

65.80

2

16.00

180.9479100

361.8958200

Strunz 9th edition incl. updates

4.DH.15

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
H: Mit großen (± mittelgroßen) [Kationen]; Lagen kantenverknüpfter Oktaeder
15:Pyrochlor-Gruppe

Lapis Classification

IV/C.13-022

IV: OXIDE
C: Oxide mit Verhältnis Metall : Sauerstoff = 2:3 (M2O3 und verwandte Verbindungen)
13: Pyrochlor-Gruppe; MIKROLITH-Untergruppe [Ta ± Nb]

Classification by Hölzel

4.CI.120

4: OXIDES
C: R2O3 Sesquioxides
I: Microlite-Group, Ta-dominant on the B-site

IMA status

anerkannt (2010) - The Canadian Mineralogist Vol. 48, pp. 673-698 (2010)
anerkannt August 2012 - CNMNC Newsletter No. 14, October 2012, page 1282; Mineralogical Magazine, 76, 1281-1288

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Pyrochlore supergroup  ⇒ Microlite group

Optical Properties

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

Cell parameters a (Å)

10.419

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volume (ų)

1131.04

Crystal structure

Struktur bestimmt

X-Ray Powder Diffraction

5.997(59), 3.138(83), 3.005(100), 2.602(29), 2.004(23), 1.841(23), 1.589(25), 1.504(24)

XRD chart Fluorcalciomicrolite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

6.46 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Brasilien/Südosten (Região Sudeste)/Minas Gerais/Nazareno/Volta Grande Pegmatit

Type material

Museu de Geociências, Instituto de Geociências, Universidade de São Paulo, São Paulo, Brasilien

Collection number of type material

DR731

Preface

Author (Name, Year)

Marcelo B. Andrade, Daniel Atencio, Hexiong Yang, Robert T. Downs, Aba I.C. Persiano und Javier Ellena (2012)

References

The Pyrochlore Supergroup of Minerals: Nomenclature; The Canadian Mineralogist Vol. 48 (2010) pp. 673-698.

CNMNC Newsletter No. 14, October 2012, page 1282; Mineralogical Magazine, 76, 1281-1288.

Clarification of status of species in the pyrochlore supergroup; Mineralogical Magazine, 2013, Vol. 77(1), pp. 13–20.

M. B. Andrade, D. Atencio, A. I. C. Persiano, J. Ellena, and G. Della Ventura: Fluorcalciomicrolite, (Ca,Na, )2Ta2O6F, a new microlite-group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. Mineral Mag Vol. 77, Nr. 7 (2013) S. 2989-2996.

IMA group assignments

Other languages

English

Fluorcalciomicrolite

German

Fluorcalciomikrolith

Russian

Фторкальциомикролит

CNMNC (IMA)-Number

IMA 2012-036

CNMNC symbol

Symbol

Fcmic

Locations with GPS information

IDs

GUSID (Global unique identifier short form) taf9EDtEY0WKGEQTu6wvmw
GUID (Global unique identifier) 10FDA7B5-443B-4563-8A18-4413BBAC2F9B
Database ID 7196