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Tobelite

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Tobelit
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Tobelit
Massiger weißer Tobelit (ohne Maßstab) von der TL Ohgidani-Lagerstätte (Ogidani; Ougidani), Tobe, Ehime, Insel Shikoku, Japan.
Copyright: Wikipedia-user: David Hospital; Contribution: oliverOliver
Location: Japan/Shikoku (Schikoku), Insel/Ehime, Präfektur/Tobe/Ohgidani Lagerstätte
Mineral: Tobelite
Image: 1702753334
License: Creative Commons - Attribution-ShareAlike 4.0 International  (CC BY-SA) V.4.0
Tobelit

Massiger weißer Tobelit (ohne Maßstab) von der TL Ohgidani-Lagerstätte (Ogidani; Ougidani), Tobe, Ehime, Insel Shikoku, Japan.
Copyright: Wikipedia-user: David Hospital
Contribution: oliverOliver 2023-12-16
Locality: Ohgidani Lagerstätte / Tobe / Ehime, Präfektur / Shikoku (Schikoku), Insel / Japan

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

Volume (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 (Schikoku), Insel/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

Tobelite

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

IDs

GUSID (Global unique identifier short form) -g8SHBPfV0qZvHBkk1XHWQ
GUID (Global unique identifier) 1C120FFA-DF13-4A57-99BC-70649355C759
Database ID 3866