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Tantite

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 7.5
Solubility +++ HF, - HCl, H2SO4
Crystal System triklin,

Chemism

Chemical formula

Ta2O5

Chemical composition

Tantal, Sauerstoff

Unit weight: 441.89297 u; Number of atoms in the formula: 7

Info

Empirical formula:

Ta2O5

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

18.10

5

71.43

15.9994300

79.9971500
Tantalum

Ta

81.90

2

28.57

180.9479100

361.8958200

Analysis wt%

Ta2O5 : 98.28, Nb2O5 : 1.36 (Ref: Mineralogicheskii Zhurnal 83)

Strunz 9th edition incl. updates

4.EA.05

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
E: Metall: Sauerstoff = < 1 :2
A:
05:Tantit-Gruppe

Lapis Classification

IV/E.01-010

IV: OXIDE
E: Oxide mit Verhältnis Metall : Sauerstoff < 1:2 (M2O5, MO3 u.a.)

Classification by Hölzel

4.EA.100

4: OXIDES
E: R2O5 RO3 and others
A: R2O5oxides

Dana 8th edition

04.06.06.01

04: Oxide Minerals
06: Simple Oxides not classified

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

RI value α / ω / n

2.29

Ri mean

2.29 Gl

2V angle

Biaxial

Crystallography

Crystal System

triklin

Cell parameters a (Å)

3.80

Cell parameters b (Å)

3.79

Cell parameters c (Å)

35.74

Cell parameters a/b or c/a

1.003

Cell parameters c/b

9.430

Cell parameters α

90.92

Cell parameters β

90.18

Cell parameters γ

90.0

Z

6

Volume (ų)

514.659

X-Ray Powder Diffraction

3.98(30),
3.14(30),
3.01(100),
2.429(50),
1.844(90),
1.573(80),
1.360(40),
1.004(50)
XRD chart Tantite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

7.5

VHN (Hardness Vickers)

133 (20g)

Density (g/cm³)

8.45 (berechnet)

8.554 ( ρ calc. Mineralienatlas )

Instability

+++ HF, - HCl, H2SO4

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Voron'i Tundry/Vasin-Myl'k, Berg

Preface

Author (Name, Year)

Voloshin & Pakhomovskiy & Perlina, 1983

References

Mineralogicheskiy Zhurnal 5 (1983) (3), 90

Other languages

German

Tantit

Spanish

Tantita

English

Tantite

French

Tantite

Russian

Тантит

CNMNC (IMA)-Number

IMA 1982-066

CNMNC symbol

Symbol

Tan

Locations with GPS information

IDs

GUSID (Global unique identifier short form) dH8_qYejPkCq1ohOVNAvsg
GUID (Global unique identifier) A93F7F74-A387-403E-AAD6-884E54D02FB2
Database ID 3760