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Boromullite (Boromullit)

Collectors Summary

Color farblos
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 6 - 7
Cleavages keine
Crystal System orthorhombisch, Cmc21
Morphology kleine (< 0,4 mm) Faserbündel

Chemism

Chemical formula

Al8[O3 BO4 AlO4 (SiO4)2]

Chemical composition

Aluminium, Silicium, Bor, Sauerstoff

Unit weight: 613.8057738 u; Number of atoms in the formula: 31

Info

Empirical formula:

Al8[O3BO4AlO4(SiO4)2]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Boron

B

1.76

1

3.23

10.8117000

10.8117000
Oxygen

O

49.53

19

61.29

15.9994300

303.9891700
Aluminium

Al

39.56

9

29.03

26.9815382

242.8338438
Silicon

Si

9.15

2

6.45

28.0855300

56.1710600

Analysis wt%

SiO2 : 19.01, B2O3 : 6.52, Al2O3 : 74.10, FeO : 0.40 (Ref: European Journal of Mineralogy 2008)

Strunz 9th edition incl. updates

9.A

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
A:

Lapis Classification

VIII/B.02-055

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
2: Kationen in tetraedrischer oder oktaedrischer Koordination [4/6]

Classification by Hölzel

9.AG.180

9: SILICATES
A: Nesosilicates
G: Nesosilicates with Cation: O
1: C small Sillimanite-Group

IMA status

anerkannt - IMA Veröffentlichung August 2007

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.022
Birefringence chart\! Boromullite title=Birefringence chart Boromullite

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

1.627

RI value β

1.634

RI value γ / ε

1.649

Ri mean

1.637

2V angle

Biaxial (+) 57°

Pleochroism

kein Pleochroismus, keine Dispersion, im Durchlicht farblos

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mm2

Space Group number

36

Space Group

Cmc21

Cell parameters a (Å)

5.717

Cell parameters b (Å)

15.023

Cell parameters c (Å)

7.675

Cell parameters a/b or c/a

0.381

Cell parameters c/b

0.511

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volume (ų)

659.179

X-Ray Powder Diffraction

5.37(50), 3.38(100), 2.67(60), 2.51(60), 2.19(80), 2.11(50), 1.682(30), 1.512(80)
XRD chart Boromullite

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

Morphology

kleine (< 0,4 mm) Faserbündel

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6 - 7

VHN (Hardness Vickers)

960 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.08 ber.

3.092 ( ρ calc. Mineralienatlas )

Cleavages

keine

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Australien/Northern Territory/Central Desert Region, LGA/Mount Stafford

Type material

South Australian Museum, Adelaide

Collection number of type material

G31520 (Holotyp) G31521 (2x Co-Typ)

Preface

Generation conditions

entsteht aus Sillimanit und Werdingit, bei Regionalmetamorphose 3-4 kbar, ca. 800 oC

Name from

der kristallchemschen Verwandtschaft mit Mullit

Author (Name, Year)

Edward S. Grew, 2007

References


IMA Veröffentlichung August 2007

Maiorova, T.P. & Filippov, V.N. (2008): The first find of Pd-telluride (merenskyite) in placer gold of the Subpolar Urals and its forecasting significance. Transactions (Doklady) of the Russian Academy of Sciences/Earth Science Section, 419A, 516-518.

Research School of Earth Sciences - Discovery of a new high-temperature borosilicate mineral: boromullite
Mineralien Welt 03/09, Steffen Jahn, Neue Mineralien

Other languages

German

Boromullit

English

Boromullite

Russian

Боромуллит

Simplified Chinese

硼莫来石

CNMNC (IMA)-Number

IMA 2007-021

CNMNC symbol

Symbol

Bmul

Locations with GPS information

IDs

GUSID (Global unique identifier short form) t5pBHoU2ykak34iwM2gAPQ
GUID (Global unique identifier) 1E419AB7-3685-46CA-A4DF-88B03368003D
Database ID 4747