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Magnesiohögbomite-2N3S

Collectors Summary

Color gelblich, bräunlich
Lustre Diamantglanz
Hardness (Mohs) 6.75
Cleavages ausgeprägt, gut (100)
Crystal System trigonal, P31m

Additional information / Summary

Benannt als MgAl2O4-dominantes 2N3S Mitglied der polysomatischen Serie der Högbomit-Gruppe. Originalbeschreibung als Högbomit-10T)

Chemism

Chemical formula

(Mg,Fe,Zn,Ti)4(Al,Fe)10O19(OH)

Additional chem. information

Benannt als MgAl2O4-dominantes 2N3S Mitglied der polysomatischen Serie der Högbomit-Gruppe.

Chemical composition

Aluminium, Eisen, Magnesium, Titan, Zink, Sauerstoff, Wasserstoff

Unit weight: 819.1936355 u; Number of atoms in the formula: 35

Info

Empirical formula:

(Mg0.55Fe0.3Zn0.1Ti0.05)4(Al0.75Fe0.25)10O19(OH)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.12

1

2.86

1.0079470

1.0079470
Oxygen

O

39.06

20

57.14

15.9994300

319.9886000
Magnesium

Mg

6.53

2.2

6.29

24.3050600

53.4711320
Aluminium

Al

24.70

7.5

21.43

26.9815382

202.3615365
Titanium

Ti

1.17

0.2

0.57

47.8671000

9.5734200
Iron

Fe

25.22

3.7

10.57

55.8452000

206.6272400
Zinc

Zn

3.19

0.4

1.14

65.4094000

26.1637600

Analysis wt%

TiO2 : 5.02, Al2O3 : 59.52, FeO : 14.73, ZnO : 8.64, MgO : 9.41 (Ref: American Mineralogist 2002)

Strunz 9th edition incl. updates

4.CB.20

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
C: Metall: Sauerstoff = 2: 3,3: 5, und vergleichbare
B: Mit mittelgroßen Kationen
20:Högbomit-Gruppe

Classification by Hölzel

4.CE.103

4: OXIDES
C: R2O3 Sesquioxides
E: Other complex Oxides, mostly hextrig
1: Högbomite-Group

IMA Classification

IMA Classification

 Högbomite supergroup  ⇒ Högbomite group

Optical Properties

Color

gelblich, bräunlich

Change in color

grau in reflektiertem Licht

Lustre

Diamantglanz

max. Birefringence

0.031
Birefringence chart\! Magnesiohögbomite-2N3S title=Birefringence chart Magnesiohögbomite-2N3S

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

1.848

RI value γ / ε

1.817

Ri mean

1.838

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

162

Space Group

P31m

Cell parameters a (Å)

5.718

Cell parameters b (Å)

-

Cell parameters c (Å)

23.02

Cell parameters a/b or c/a

4.026

Cell parameters c/b

-

Z

2

Volume (ų)

651.815

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6.75

VHN (Hardness Vickers)

1140 (100g)

Density (g/cm³)

4.03 (berechnet) 3.699 - 3.8 (gemessen)

4.174 ( ρ calc. Mineralienatlas )

Cleavages

ausgeprägt, gut (100)

(Co-)Type locality

(Co-)Type locality

Australien/South Australia/Flinders Ranges/North Flinders Ranges/Arkaroola, Region/Mt Painter/Corundum Creek

Preface

Name from

als Mg dominantes Mineral der Högbomit-Gruppe und dem 2N3S Polysom

Author (Name, Year)

McKie, 1963; Hejny & Armbruster, 2002

References

T. Armbruster - Revised nomenclature of högbomite, nigerite, and taaffeite minerals.- Eur. Journ. Mineralogy 14 (2002), 389-395

Clivia Henjy and Thomas Armbruster - Polysomatism in högbomite: The crystal structures of 10T, 12H, 14T, and 24R polysomes - American Mineralogist, Volume 87 (2002), pages 277–292 [type locality] http://www.krist.unibe.ch/pdf/2002/Hejny_p277-292_02.pdf

IMA group assignments

Other languages

German

Magnesiohögbomit-2N3S

Spanish

Magnesiohögbomita-2N3S

English

Magnesiohögbomite-2N3S

Japanese

苦土ﾎｸﾞﾎﾞﾏｲﾄ-2N3S

old name

German

Högbomite-10T (nach Hejny & Armbruster)

English

Högbomite-10T (of Hejny & Armbruster)

CNMNC symbol

Symbol

Mhög-2N3S

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 1_8Lmq2CzkaRqHaQnfV1VQ
GUID (Global unique identifier) 9A0BFFD7-82AD-46CE-91A8-76909DF57555
Database ID 4540