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Tantalaeschynite-(Y) (Tantalaeschynit-(Y))

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Tantalaeschynit-(Y)
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Tantalaeschynit-(Y)
Probe von Tantalaeschynit-(Y), Raposa Pegmatit, São José do Sabugi, Paraiba, Brasilien; BB ~ 9 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Brasilien/Nordosten (Região Nordeste)/Paraíba/Sao Jose do Sabugi/Raposa Pegmatit
Mineral: Tantalaeschynite-(Y)
Image: 1631645025
License: Usage for Mineralienatlas project only
Tantalaeschynit-(Y)

Probe von Tantalaeschynit-(Y), Raposa Pegmatit, São José do Sabugi, Paraiba, Brasilien; BB 9 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2021-09-14
Locality: Raposa Pegmatit / Sao Jose do Sabugi / Paraíba / Nordosten (Região Nordeste) / Brasilien

Collectors Summary

Color dunkelgrau mit reichlich weiß zu dunkelrot internen Reflektionen
Streak color gelblich braun
Lustre Harzglanz
Hardness (Mohs) 5.5 - 6
Fracture muschelig
Crystal System orthorhombisch, Pbnm

Chemism

Chemical formula

(Ca,Y,Ce)(Ta,Ti,Nb)2O6

Empirical formula (analysis)

(Ca0.47Y0.17Ce0.10REE0.14Th0.10)(Ta0.75Ti0.62Nb0.60)O6

Additional chem. information

laut CNMNC: Y(Ta,Ti,Nb)2O6;

Chemical composition

Calcium, Cerium, Niob, Tantal, Titan, Yttrium, Sauerstoff

Unit weight: 408.45520754 u; Number of atoms in the formula: 8.95

Info

Empirical formula:

(Ca0.47Y0.17Ce0.10REE0.14Th0.10)(Ta0.75Ti0.62Nb0.60)O6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

23.50

6

67.04

15.9994300

95.9965800
Calcium

Ca

4.61

0.47

5.25

40.0784000

18.8368480
Titanium

Ti

7.27

0.62

6.93

47.8671000

29.6776020
Yttrium

Y

3.70

0.17

1.90

88.9058520

15.1139948
Niobium

Nb

13.65

0.6

6.70

92.9063820

55.7438292
Cerium

Ce

3.43

0.1

1.12

140.1161000

14.0116100
Rare Earth

REE

4.94

0.14

1.56

144.0000000

20.1600000
Tantalum

Ta

33.23

0.75

8.38

180.9479100

135.7109325
Thorium

Th

5.68

0.1

1.12

232.0381100

23.2038110

Analysis wt%

CaO : 6.20, Fe2O3 : 0.90, La2O3 : 1.30, Ce2O3 : 3.70, Pr2O3 : 0.60, Nd2O3 : 1.90, Sm2O3 : 0.60, Gd2O3 : 0.60, Dy2O3 : 0.40, Er2O3 : 0.40, Yb2O3 : 0.70, Y2O3 : 4.60, TiO2 : 11.70, ThO2 : 6.50, UO2 : 0.40, Nb2O5 : 18.70, Ta2O5 : 39.90, Ln2O3 : 14.80 (Ref: Mineralogical Magazine 74)

Strunz 9th edition incl. updates

4.DF.05

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
F: Mit großen (± mittelgroßen) Kationen; dimers und trimers kantenverknüpfte Oktaeder
05:Aeschynit-Gruppe

Lapis Classification

IV/D.21-080

IV: OXIDE
D: Oxide mit Verhältnis Metall : Sauerstoff = 1:2 (MO2 und verwandte Verbindungen)
21: Aeschynit-Gruppe

Classification by Hölzel

4.DJ.330

4: OXIDES
D: Dioxides
J: Titanates, Niobates and Tantalates, C large, V medium ò 2
3: Aeschynite-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Aeschynite group

Optical Properties

Color

dunkelgrau mit reichlich weiß zu dunkelrot internen Reflektionen

Streak color

gelblich braun

Change in color

im reflektierten Licht, dunkelgrau mit reichlich weiß bis dunkelroten inneren Reflexionen

Diaphaneity (Transparency)

teilweise durchscheinend

Lustre

Harzglanz

Reflectivity: (Lambda nm) ↓, ↑, Ø

(470) 14.5, , 14.5
(546) 14.2, , 14.2
(589) 14.0, , 14.0
(650) 14.0, , 14.0
Reflection chart Tantalaeschynite-(Y)

Reflectivity Ø

14.18

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pbnm

Cell parameters a (Å)

5.34

Cell parameters b (Å)

10.97

Cell parameters c (Å)

7.38

Cell parameters a/b or c/a

0.487

Cell parameters c/b

0.673

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

432.319

X-Ray Powder Diffraction

3.71(30),
3.00(100),
2.94(100),
2.65(50),
2.21(30),
1.86(40),
1.70(50),
1.581(70)
XRD chart Tantalaeschynite-(Y)

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.5 - 6

VHN (Hardness Vickers)

657 - 673 (100g)

Density (g/cm³)

6.39 (berechnet) 5.75 - 6.13 (gemessen an unreinem Material)

6.275 ( ρ calc. Mineralienatlas )

Fracture

muschelig

Radioactivity

radioaktiv

(Co-)Type locality

(Co-)Type locality

Brasilien/Nordosten (Região Nordeste)/Paraíba/Sao Jose do Sabugi/Raposa Pegmatit

Type material

Department of Geosciences, Universität von Brasilia, Brasilia, Brasilien

Institute of Earth Sciences, Freie Universität von Amsterdam, Amsterdam, Niederlande

Collection number of type material

NT-52

Preface

Name from

für Aeschinit mit Tantalanteil größer als Titaniumanteil und Yttrium als das dominate Seltenerden-Element

Author (Name, Year)

Adusumilli & Kieft & Burke, 1974

References

Mineralogical Magazine 39 (1974), 571

Tidying up mineral names: an IMA-CNMNC scheme for suffixes, hyphens and diacritical marks: Mineral. Record, 39 (2008), 131-135

IMA group assignments

Other languages

German

Tantalaeschynit-(Y)

French

Tantalaeschynite-(Y)

English

Tantalaeschynite-(Y)

Spanish

Tantalesquinita-(Y)

Russian

Танталэшинит-(Y)

Japanese

ｲｯﾄﾛﾀﾝﾀﾗｴｼｰﾅｲﾄ

old name

German

Tantal-Aeschynit-(Y)

English

Tantal-aeschynite-(Y)

French

Tantal-aeschynite-(Y)

Spanish

Tantal-esquinita-(Y)

CNMNC symbol

Symbol

Taes-Y

Locations with GPS information