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Kotoite (Kotoit)

Pictures (1 Images total)

Kotoit (grau, massiv) mit Ludwigit (schwarz)
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1243973945
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Kotoit (grau, massiv) mit Ludwigit (schwarz)
Größe: 65x45x25 mm; Fundort: Nalednoe, Tas-Khayakhtakh-Gebirge, Jakutien, Russland
Copyright: Pavel M. Kartashov; Contribution: Philip Blümner
Location: Russland/Ferner Osten, Föderationskreis/Sacha (Sakha, Jakutien, Якутия), Republik/Tas-Khayakhtakh-Gebirge/Nalednoe
Mineral: Kotoite, Ludwigite
Image: 1243973945
License: Usage for Mineralienatlas project only
Kotoit (grau, massiv) mit Ludwigit (schwarz)

Größe: 65x45x25 mm; Fundort: Nalednoe, Tas-Khayakhtakh-Gebirge, Jakutien, Russland
Copyright: Pavel M. Kartashov
Contribution: Philip Blümner 2009-06-02
Locality: Nalednoe / Tas-Khayakhtakh-Gebirge / Sacha (Sakha, Jakutien, Якутия), Republik / Ferner Osten, Föderationskreis / Russland

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 6.5
Solubility +++ Säuren
Crystal System orthorhombisch, Pnmn

Chemism

Chemical formula

Mg3B2O6

Chemical composition

Magnesium, Bor, Sauerstoff

Unit weight: 190.53516 u; Number of atoms in the formula: 11

Info

Empirical formula:

Mg3B2O6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Boron

B

11.35

2

18.18

10.8117000

21.6234000
Oxygen

O

50.38

6

54.55

15.9994300

95.9965800
Magnesium

Mg

38.27

3

27.27

24.3050600

72.9151800

Analysis wt%

MgO : 62.78, B2O3 : 35.20, SiO2 : 1.32, FeO : 0.61 (Ref: Min.Petr.Mitt.39)

Strunz 9th edition incl. updates

6.AA.35

6: Borate
A: Monoborate
A: BO3 ohne zusätzliche Anionen; 1(Δ)
35:Kotoit-Gruppe

Lapis Classification

V/G.01-010

V: NITRATE, CARBONATE UND BORATE
G: Inselborate
1: [BO3] 3--Inseln

Classification by Hölzel

6.AA.300

6: Borates
A: Monoborates
A: BO3, without additional anions - 1(P) - REM: P = planar trigonal anion
3: Kotoite-Group

Dana 8th edition

24.03.02.01

24: Borates - Anhydrous
03: Borates - Anhydrous where (A)m (B)n [XO3]p

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.022
Birefringence chart\! Kotoite title=Birefringence chart Kotoite

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

1.652

RI value β

1.653

RI value γ / ε

1.674

Ri mean

1.660

2V angle

Biaxial (+) 21°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

58

Space Group

Pnmn

Cell parameters a (Å)

5.398

Cell parameters b (Å)

8.416

Cell parameters c (Å)

4.497

Cell parameters a/b or c/a

0.641

Cell parameters c/b

0.534

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volume (ų)

204.297

X-Ray Powder Diffraction

3.472(80),
2.671(100),
2.232(100),
2.180(100),
1.729(100),
1.669(100),
1.515(100)
XRD chart Kotoite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6.5

VHN (Hardness Vickers)

960 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.04 (gemessen)

3.097 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Nordkorea/Hwanghae-pukto (Nord-Hwanghae), Provinz/Suan-gun/Hol Kol Mine (Holgol; Suan; Namjong)/Nord-Erzkörper

Preface

Name from

Bundjirô Kotô (1856-1935), japanischer Geologe und Petrograph an der Universität von Tokyo, der die Erzlagerstätten von Hol Kol, Nordkorea studierte.

Author (Name, Year)

Watanabe, 1939

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 370

Other languages

German

Kotoit

French

Kotoite

English

Kotoite

Spanish

Kotoíta

Russian

Котоит

Simplified Chinese

粒镁硼石

CNMNC symbol

Symbol

Ko

Locations with GPS information

IDs

GUSID (Global unique identifier short form) l7b8_4sce06yUyNsWCsREw
GUID (Global unique identifier) FFFCB697-1C8B-4E7B-B253-236C582B1113
Database ID 2043