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Tumchaite

Pictures (1 Images total)

Tumchait
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1581183243
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Tumchait
farbloser Kristall von Tumchait, Vuoriyarvi Massiv, Kola, Russland; BB < 1 mm, analysiert mittels REM-EDX
Copyright: Joy Desor; Contribution: openpit
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Vuorijärvi-Massiv (Vuoriyarvi)
Mineral: Tumchaite
Image: 1581183243
License: Usage for Mineralienatlas project only
Tumchait  E
Analysed with energy dispersive X-ray spectroscopy EDX

farbloser Kristall von Tumchait, Vuoriyarvi Massiv, Kola, Russland; BB < 1 mm, analysiert mittels REM-EDX
Copyright: Joy Desor
Contribution: openpit 2020-02-08
Locality: Vuorijärvi-Massiv (Vuoriyarvi) / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color farblos, weiß
Streak color weiß
Hardness (Mohs) 4.5
Cleavages vollkommen (100)
Fracture uneben
Solubility - verdünnte HCl
Crystal System monoklin, P21/c

Chemism

Chemical formula

Na2(Zr,Sn)[Si4O11]·2H2O

Chemical composition

Natrium, Silicium, Zinn, Zirconium, Sauerstoff, Wasserstoff

Unit weight: 468.4418634 u; Number of atoms in the formula: 24

Info

Empirical formula:

Na2(Zr0.75Sn0.25)[Si4O11]·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.86

4

16.67

1.0079470

4.0317880
Oxygen

O

44.40

13

54.17

15.9994300

207.9925900
Sodium

Na

9.82

2

8.33

22.9897702

45.9795404
Silicon

Si

23.98

4

16.67

28.0855300

112.3421200
Zirconium

Zr

14.61

0.75

3.13

91.2242000

68.4181500
Tin

Sn

6.34

0.25

1.04

118.7107000

29.6776750

Analysis wt%

Ø SiO2 : 52.71, HfO2 : 0.60, ZrO2 : 20.41, SnO2 : 5.73, Na2O : 13.72, H2O : 7.86 (Ref: American Mineralogist 2000)

Strunz 9th edition incl. updates

9.EA.60

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
A: Einfache Tetraedernetze mit 4-, 5-, (6-), und 8 beteiligten Ringen
60:Penkvilksit-Gruppe

Lapis Classification

VIII/F.34-040

VIII: SILIKATE
F: Ketten- und Bandsilikate
34: Komplexe Kettenstrukturen (Zylinderketten u.a.)

Classification by Hölzel

9.DS.220

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
S: ~[Si8O20]8--.. or ~[Si8O22]12--... Cylinder-Chains Narsarsukite-Group

Dana 8th edition

70.02.02.02

70: Inosilicates Inosilicate Column or Tube Structures
02: Inosilicates Inosilicate Column or Tube Structures with Si2O7 dimers

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, weiß

Streak color

weiß

max. Birefringence

0.024
Birefringence chart\! Tumchaite title=Birefringence chart Tumchaite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.570

RI value β

1.588

RI value γ / ε

1.594

Ri mean

1.584

2V angle

Biaxial (-) 60°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell parameters a (Å)

9.144

Cell parameters b (Å)

8.818

Cell parameters c (Å)

7.537

Cell parameters a/b or c/a

1.037

Cell parameters c/b

0.855

Cell parameters α

90°

Cell parameters β

113.22

Cell parameters γ

90°

Z

2

Volume (ų)

558.495

X-Ray Powder Diffraction

8.40(100),
5.38(90),
4.00(80),
3.401(90),
2.902(90),
2.772(70),
2.691(90),
2.190(70)
XRD chart Tumchaite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.5

VHN (Hardness Vickers)

410 (40g)

Density (g/cm³)

2.78 (gemessen)

2.785 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (100)

Fracture

uneben

Tenacity

sehr spröde

Instability

- verdünnte HCl

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Vuorijärvi-Massiv (Vuoriyarvi)

Preface

Author (Name, Year)

Subbotin & Merlino & Pushcharovsky & Pakhomovsky & Ferro & Bogdanova &

References

American Mineralogist 85 (2000), 1516

Other languages

German

Tumchait

English

Tumchaite

French

Tumchaite

Spanish

Tumchaíta

Russian

Тумчаит

CNMNC (IMA)-Number

IMA 1999-041

CNMNC symbol

Symbol

Tum

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Ddh1MXKnLUW0RG2W5AgVNQ
GUID (Global unique identifier) 3175D80D-A772-452D-B444-6D96E4081535
Database ID 3939