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Tobelite

Collectors Summary

Color gelblich grün, perlweiß
Streak color weiß
Lustre stumpf
Hardness (Mohs) 2
Crystal System monoklin, C2/m

Chemism

Chemical formula

(NH4,K)Al2(Si3Al)O10(OH)2

Chemical composition

Aluminium, Silicium, Kalium, Sauerstoff, Stickstoff, Wasserstoff

Unit weight: 382.5137171 u; Number of atoms in the formula: 24

Info

Empirical formula:

((NH4)0.75K0.25)Al2(Si3Al)O10(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.32

5

20.83

1.0079470

5.0397350
Nitrogen

N

2.75

0.75

3.13

14.0067200

10.5050400
Oxygen

O

50.19

12

50.00

15.9994300

191.9931600
Aluminium

Al

21.16

3

12.50

26.9815382

80.9446146
Silicon

Si

22.03

3

12.50

28.0855300

84.2565900
Potassium

K

2.56

0.25

1.04

39.0983100

9.7745775

Strunz 9th edition incl. updates

9.EC.15

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
15:Muskovit-Gruppe

Lapis Classification

VIII/H.10-100

VIII: SILIKATE
H: Schichtsilikate
10: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Glimmer-Gruppe; Seladonit/Muskovit-Reihe (Phengite)

Classification by Hölzel

9.EC.100

9: SILICATES
E: Phyllosilicates
C: Micas-Group
1: ~[(OH)2|AlSi3O10] Muscovite-Group

Hey's Chemical Index of Minerals

16.05.05

16: Silicates Containing Aluminum and other Metals
05: Aluminosilicates of Cs, NH4 and Cu

Dana 8th edition

71.02.02a.07

71: Phyllosilicate Minerals
02: Phyllosilicates Phyllosilicate Sheets of Six-Membered Rings with 2:1 Layers
02a: Mica Group (Muscovite subgroup)

IMA status

anerkannt; = 1M Polytyp

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Mica group  ⇒ True micas

Optical Properties

Color

gelblich grün, perlweiß

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend

Lustre

stumpf

max. Birefringence

0.026
Birefringence chart\! Tobelite title=Birefringence chart Tobelite

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

1.555

RI value β

1.575

RI value γ / ε

1.581

Ri mean

1.570

2V angle

Biaxial (-) 28°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

5.219

Cell parameters b (Å)

8.986

Cell parameters c (Å)

10.447

Cell parameters a/b or c/a

0.581

Cell parameters c/b

1.163

Cell parameters α

90°

Cell parameters β

101.32

Cell parameters γ

90°

Z

2

Volumne (ų)

480.411

X-Ray Powder Diffraction

10.44(100),
5.12(70),
4.486(70),
4.360(30),
3.685(30),
3.408(60),
3.103(30),
2.566(40)
XRD chart Tobelite

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)

2

VHN (Hardness Vickers)

32 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.58 (gemessen) 2.617 /berechnet)

2.644 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Japan/Shikoku/Ehime, Präfektur/Tobe/Ohgidani Lagerstätte

Preface

Name from

Typlokalität (Tobe)

Author (Name, Year)

Higashi, 1982

References

Mineralogical Journal (Tokyo) 11 (1982), 138.

American Mineralogist 68 (1983), 850.

Canadian Mineralogist 36 (1998), 905-912.

Physics and Chemistry of Minerals 28 (2001), 268.

American Mineralogist 87 (2002), 1686.

IMA group assignments

Other languages

Spanish

Tobelita

French

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English

Tobelite

German

Tobelith

Russian

Тобелит

Alternative Name

Tobelit

Tobelita

Japanese

砥部石

Japanese

砥部雲母

CNMNC symbol

Symbol

Tbl

Locations with GPS information