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Magnesiotaaffeite-6N'3S

Collectors Summary

Color oliv, dunkelgrün, schwarz
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 8 - 8.5
Solubility verdünnte HCL
Crystal System trigonal, R3m

Chemism

Chemical formula

(Mg,Fe2+,Zn)2Al6BeO12

Chemical composition

Aluminium, Beryllium, Eisen, Magnesium, Zink, Sauerstoff

Unit weight: 438.6496435 u; Number of atoms in the formula: 21

Info

Empirical formula:

(Mg0.6Fe0.3Zn0.1)2Al6BeO12

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Beryllium

Be

2.05

1

4.76

9.0121823

9.0121823
Oxygen

O

43.77

12

57.14

15.9994300

191.9931600
Magnesium

Mg

6.65

1.2

5.71

24.3050600

29.1660720
Aluminium

Al

36.91

6

28.57

26.9815382

161.8892292
Iron

Fe

7.64

0.6

2.86

55.8452000

33.5071200
Zinc

Zn

2.98

0.2

0.95

65.4094000

13.0818800

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.163

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

Hey's Chemical Index of Minerals

07.04.06

07: Oxides and Hydroxides
04: Oxides of Be, Mg and the alkaline earths

Dana 8th edition

07.02.12.01

07: Multiple Oxides
02: Multiple Oxides (A+ B++)2 X4 Spinel group
12: Taaffeite Group (T2 = Be + T)

IMA status

Originalbeschreibung als Taaffeit - Polytyp; von Schmetzer (1983) als Musgravit bezeichnet, (2002) von Armbruster umbenannt.

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Högbomite supergroup  ⇒ Taaffeite group

Optical Properties

Color

oliv, dunkelgrün, schwarz

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend

Lustre

Glasglanz

max. Birefringence

0.004
Birefringence chart\! Magnesiotaaffeite-6N'3S title=Birefringence chart Magnesiotaaffeite-6N'3S

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

1.735

RI value γ / ε

1.739

Ri mean

1,737

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

166

Space Group

R3m

Cell parameters a (Å)

5.67

Cell parameters b (Å)

-

Cell parameters c (Å)

41.09

Cell parameters a/b or c/a

7.247

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

6

Volume (ų)

1144.018

X-Ray Powder Diffraction

13.70(60),
2.836(60),
2.656(60),
2.519(50),
2.410(100),
2.269(60),
2.054(60),
1.487(60)
XRD chart Magnesiotaaffeite-6N'3S

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)

8 - 8.5

Density (g/cm³)

3.68 (gemessen) 3.69 (berechnet)

3.82 ( ρ calc. Mineralienatlas )

Instability

verdünnte HCL

(Co-)Type locality

(Co-)Type locality

Australien/South Australia/Musgrave Ranges/Ernabella Mission

Preface

Rareness

Rare

Name from

Der Originalname Musgravit wurde nach der Fundregion Ernabella Mission, Musgrave Ranges, Südaustralien benannt. Jetzt nach der Zugehörigkeut zu Taaffeit.

Author (Name, Year)

Armbruster, 2002

References

Neues Jahrbuch für Mineralogie, Abhandlungen 146 (1983), 146.

American Mineralogist 66 (1981), 1022.

Neues Jahrbuch für Mineralogie, Monatshefte (1983), 393-402.

Neues Jahrbuch für Mineralogie, Abhandlungen: 146: 15-28.

American Mineralogist 69 (1984), 215.

Mineralogical Magazine 57 (1993), 121.

European Journal of Mineralogy 14 (2002), 389-395.

IMA group assignments

Other languages

German

Magnesiotaaffeit-6N’3S

English

Magnesiotaaffeite-6N'3S

Russian

Магнезиотааффеит-6N'3S

old name

English

Musgravite-18R

Alternative Name

German

Magnesiotaaffeit-6N'3S

German

Magnesiotaaffeit-6N3S

English

Magnesiotaaffeite-6N3S

English

Magnesiotaaffeite-6N’3S

German

Musgravit

English

Musgravite

English

Taaffeite-9R

CNMNC (IMA)-Number

IMA 1966-041

CNMNC symbol

Symbol

Mtf- 6N'3S

Locations with GPS information

IDs

GUSID (Global unique identifier short form) _RTjRVuzIkCZfm4uBSoCoA
GUID (Global unique identifier) 45E314FD-B35B-4022-997E-6E2E052A02A0
Database ID 2317