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Nioboaeschynite-(Y) (IMA 2003-038a)

Collectors Summary

Color tiefbräunlichrot bis schwarz
Streak color graubraun
Lustre Glasglanz
Hardness (Mohs) 5.5
Cleavages keine
Fracture muschelig
Crystal System orthorhombisch, Pbnm
Morphology Das Mineral bildet subidiomorphe Kristalle bis zu 1 cm Größe.

Chemism

Chemical formula

[(Y,Ln),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6

Chemical composition

Calcium, Eisen, Niob, Tantal, Thorium, Titan, Yttrium, Sauerstoff, Wasserstoff, Lanthanoide

Unit weight: 370.27613085 u; Number of atoms in the formula: 10.5

Info

Empirical formula:

[((Y0.75Ln0.25))0.55Ca0.3Th0.1Fe0.05](Nb0.6Ti0.3Ta0.1)2(O0.75(OH)0.25)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Lanthanoide

Ln

5.85

0.14

1.31

157.6500000

21.6768750

Hydrogen

H

0.41

1.5

14.29

1.0079470

1.5119205

Oxygen

O

25.93

6

57.14

15.9994300

95.9965800

Calcium

Ca

3.25

0.3

2.86

40.0784000

12.0235200

Titanium

Ti

7.76

0.6

5.71

47.8671000

28.7202600

Iron

Fe

0.75

0.05

0.48

55.8452000

2.7922600

Yttrium

Y

9.90

0.41

3.93

88.9058520

36.6736640

Niobium

Nb

30.11

1.2

11.43

92.9063820

111.4876584

Tantalum

Ta

9.77

0.2

1.90

180.9479100

36.1895820

Thorium

Th

6.27

0.1

0.95

232.0381100

23.2038110

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.21-045

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

Classification by Hölzel

4.DJ.350

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

IMA status

anerkannt 08/2006

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Aeschynite group

Optical Properties

Color

tiefbräunlichrot bis schwarz

Streak color

graubraun

Diaphaneity (Transparency)

durchscheinend bis opak

Lustre

Glasglanz

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pbnm

Cell parameters a (Å)

5.279

Cell parameters b (Å)

10.966

Cell parameters c (Å)

7.443

Cell parameters a/b or c/a

0.481

Cell parameters c/b

0.679

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

430.872

X-Ray Powder Diffraction

3.079(20), 3.009(100), 2.970(36), 2.931(69), 2.783(12), 2.636(12), 1.863(14), 1.580(16)

XRD chart Nioboaeschynite-(Y)

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

Morphology

Das Mineral bildet subidiomorphe Kristalle bis zu 1 cm Größe.

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.5

VHN (Hardness Vickers)

922 (100g)

Density (g/cm³)

5.34 gem.

5.708 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

muschelig

Tenacity

spröde

Preface

Name from

der kristallchemischen Verwandtschaft mit den Mineralien der Aeschynit-Gruppe und dem dominierenden Kation auf der B-Position (Niob). Der Levinson modifier weist auf das dominierende SEE (hier Yttrium) hin.

Author (Name, Year)

Bermanec

References

Commission on New Minerals, Nomenclature and Classification Publication Pending
Mineralien Welt 05/09, Steffen Jahn, Neue Mineralien

IMA group assignments

Other languages

German

Nioboaeschynit-(Y)

Spanish

Nioboaeschynita-(Y)

English

Nioboaeschynite-(Y)

Russian

Ниобоэшинит-(Y)

Simplified Chinese

铌钇易解石

Alternative Name

German

Niobo-Aeschynit-(Y)

English

Niobo-aeschynite-(Y)

CNMNC (IMA)-Number

IMA 2003-038a

CNMNC symbol

Symbol

Naes-Y

Locations with GPS information

IDs

GUSID (Global unique identifier short form) TLe4B1--4kq_rQI81kDBLw
GUID (Global unique identifier) 07B8B74C-BE5F-4AE2-BFAD-023CD640C12F
Database ID 4388