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Brammallite

Collectors Summary

Color weiß
Streak color weiß
Cleavages vollkommen
Crystal System monoklin, C2/c

Chemism

Chemical formula

(Na,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,H2O]

Chemical composition

Aluminium, Eisen, Magnesium, Natrium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 381.37539194 u; Number of atoms in the formula: 21.5

Info

Empirical formula:

(Na0.75(H3O)0.25)(Al0.6Mg0.3Fe0.1)2(Si0.75Al0.25)4O10[((OH)2)0.75(H2O)0.25]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.73

2.75

12.79

1.0079470

2.7718543
Oxygen

O

50.34

12

55.81

15.9994300

191.9931600
Sodium

Na

4.52

0.75

3.49

22.9897702

17.2423277
Magnesium

Mg

3.82

0.6

2.79

24.3050600

14.5830360
Aluminium

Al

15.56

2.2

10.23

26.9815382

59.3593840
Silicon

Si

22.09

3

13.95

28.0855300

84.2565900
Iron

Fe

2.93

0.2

0.93

55.8452000

11.1690400

Strunz 9th edition incl. updates

9.EC.25

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
25:Illit-Gruppe

Lapis Classification

VIII/H.13-020

VIII: SILIKATE
H: Schichtsilikate
13: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Glimmer-Gruppe; Alkali-defizitäre Glimmer (Anhang)

IMA status

Mineralgruppe

Mineral status

Reihe/Gruppe/Serie/Folge

IMA Classification

IMA Classification

 Mica group  ⇒ Micas with lack of interlayers (IDM)

Optical Properties

Color

weiß

Streak color

weiß

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters α

90°

Cell parameters γ

90°

Z

4

X-Ray Powder Diffraction

9.77(100),
4.78(80),
4.406(90),
3.169(100),
2.542(90),
2.410(60),
2.112(60),
1.485(100)
XRD chart Brammallite

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

Physical Properties

Cleavages

vollkommen

(Co-)Type locality

(Co-)Type locality

UK/Wales/Carmarthenshire/Llandybie

Preface

Author (Name, Year)

Bannister, 1943

References

Canadian Mineralogist 36 (1998), 905

IMA group assignments

Other languages

German

Brammallit

Spanish

Brammallita

French

Brammallite

English

Brammallite

Japanese

ﾌﾞﾗﾏｰﾙﾗｲﾄ

Alternative Name

English

Hydroparagonite

Sodium-Illite

CNMNC symbol

Symbol

Bml

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Shyia-pe_0uvEUv9m70eEw
GUID (Global unique identifier) 6BA21C4A-5EEA-4BFF-AF11-4BFD9BBD1E13
Database ID 478