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Oxycalciomicrolite

Pictures (2 Images total)

Oxycalciomikrolith
Views (File:
1378229214
): 796
Oxycalciomikrolith
Kristallgröße: 0,5 mm, Fundort: Ipe Mine, Governador Valadares, Minas Gerais, Brasilien
Copyright: Luigi Mattei; Contribution: thdun5
Location: Brasilien/Südosten (Região Sudeste)/Minas Gerais/Doce-Tal/Governador Valadares/Ipê Mine
Mineral: Oxycalciomicrolite
Image: 1378229214
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Oxycalciomikrolith

Kristallgröße: 0,5 mm, Fundort: Ipe Mine, Governador Valadares, Minas Gerais, Brasilien

Copyright: Luigi Mattei
Contribution: thdun5 2013-09-03
Locality: Ipê Mine / Governador Valadares / Doce-Tal / Minas Gerais / Südosten (Região Sudeste) / Brasilien
Oxycalciomikrolith
Views (File:
1378229245
): 703
Oxycalciomikrolith
Kristallgröße: 0,4 mm, Fundort: Ipe Mine, Governador Valadares, Minas Gerais, Brasilien
Copyright: Luigi Mattei; Contribution: thdun5
Location: Brasilien/Südosten (Região Sudeste)/Minas Gerais/Doce-Tal/Governador Valadares/Ipê Mine
Mineral: Oxycalciomicrolite
Image: 1378229245
License: Usage for Mineralienatlas project only
Oxycalciomikrolith

Kristallgröße: 0,4 mm, Fundort: Ipe Mine, Governador Valadares, Minas Gerais, Brasilien

Copyright: Luigi Mattei
Contribution: thdun5 2013-09-03
Locality: Ipê Mine / Governador Valadares / Doce-Tal / Minas Gerais / Südosten (Região Sudeste) / Brasilien

Collectors Summary

Hardness (Mohs) 4.75
Crystal System kubisch, Fd3m

Chemism

Chemical formula

Ca2Ta2O7

Chemical composition

Calcium, Tantal, Sauerstoff

Unit weight: 554.04863 u; Number of atoms in the formula: 11

Info

Empirical formula:

Ca2Ta2O7

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

20.21

7

63.64

15.9994300

111.9960100

Calcium

Ca

14.47

2

18.18

40.0784000

80.1568000

Tantalum

Ta

65.32

2

18.18

180.9479100

361.8958200

Analysis wt%

Ø Ta2O5 : 53.22, Nb2O5 : 15.38, Sb2O3 : 17.37, CaO : 9.58, Na2O : 2.14 (Ref: Geologiska Föreningens i Stockholm 87)

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.13-024

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.140

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

IMA status

anerkannt - CNMNC Newsletter 54 (2020)

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Pyrochlore supergroup  ⇒ Microlite group

Optical Properties

RI value α / ω / n

2.12

Ri mean

2.12

2V angle

Isotropisch

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

Cell parameters a (Å)

10.3803(6)

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

Volumne (ų)

1118.484

Kristall structure

Pyrochlor-Supergruppe; Struktur ermittelt

X-Ray Powder Diffraction

6.023(89), 3.145(44), 3.011(100), 2.608(25), 2.008(14), 1.844(48), 1.763(11), 1.573(33)

XRD chart Oxycalciomicrolite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.75

VHN (Hardness Vickers)

340 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

6.03 (gemessen)

6.58 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Brasilien/Südosten (Região Sudeste)/Minas Gerais/Nazareno/Fumal Pegmatit

Type material

Typisches Material ist in den mineralogischen Sammlungen des Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista sn, 20940-040 Rio de Janeiro, Brasilien, hinterlegt, Registriernummer MN-7601-M

Preface

Name from

Benannt nach dem sauerstoff- und kalziumdominanten Mitglied der Mikrolith-Gruppe.

Author (Name, Year)

Victor Hugo Riboura Menezes da Silva, Reiner Neumann, Ciro Alexandre Ávila, Fabiano Richard Leite Faulstich, Felipe Emerson André Alves, und Filipe Barra de Almeida (2020)

References

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

Menezes da Silva, V. H. R., Neumann, R., Ávila, C. A., Faulstich, F. R. L., Alves, F. E. A., and de Almeida, F. B.: Oxycalciomicrolite, IMA 2019-110, in: CNMNC Newsletter 54, Eur. J. Mineral., 32, https://doi.org/10.5194/ejm-32-275-2020, 2020.

IMA group assignments

Other languages

English

Oxycalciomicrolite

German

Oxycalciomikrolith

CNMNC (IMA)-Number

IMA 2019-110

CNMNC symbol

Symbol

Ocmic

Locations with GPS information