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Brinrobertsite (Brinrobertsit)

Collectors Summary

Color grau, gelbgrau
Streak color grau
Lustre matt, Glasglanz
Hardness (Mohs) 1
Cleavages vollkommen {001}
Crystal System monoklin,
Morphology Anhedrale Körner in Aggregaten bis zu 0,02 mm Durchmesser. Einzelne Körner weniger als 1 μm.

Chemism

Chemical formula

(Na,K,Ca)0.3(Al,Fe,Mg)4(Si,Al)8O20(OH)4·3.5H2O

Chemical composition

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

Unit weight: 823.899312616 u; Number of atoms in the formula: 50.8

Info

Empirical formula:

(Na0.6K0.3Ca0.1)0.3(Al0.6Fe0.3Mg0.1)4(Si0.75Al0.25)8O20(OH)4·3.5H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.35

11

21.65

1.0079470

11.0874170
Oxygen

O

53.40

27.5

54.13

15.9994300

439.9843250
Sodium

Na

0.50

0.18

0.35

22.9897702

4.1381586
Magnesium

Mg

1.18

0.4

0.79

24.3050600

9.7220240
Aluminium

Al

14.41

4.4

8.66

26.9815382

118.7187681
Silicon

Si

20.45

6

11.81

28.0855300

168.5131800
Potassium

K

0.43

0.09

0.18

39.0983100

3.5188479
Calcium

Ca

0.15

0.03

0.06

40.0784000

1.2023520
Iron

Fe

8.13

1.2

2.36

55.8452000

67.0142400

Analysis wt%

SiO2 74.82, Al2O3 12.01, TiO2 0.17, Fe2O3 7.66, MgO 1.03, CaO 0.17, Na2O 1.03, K2O 0.31, MnO 0.06, P2O5 0.02, LOI 3.01, gesamt 100.30 Gewicht%

Strunz 9th edition incl. updates

9.EC.60

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

Lapis Classification

VIII/H.19-010

VIII: SILIKATE
H: Schichtsilikate
19: Tonminerale, regulär geschichtet; Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Montmorillonit-Gruppe

Classification by Hölzel

9.EB.210

9: SILICATES
E: Phyllosilicates
B: ~[(OH)2|Si4O10] Pyrophyllite-Talc-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

grau, gelbgrau

Streak color

grau

Diaphaneity (Transparency)

durchscheinend

Lustre

matt, Glasglanz

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

monoklin

Cell parameters a (Å)

5.2

Cell parameters b (Å)

9.1

Cell parameters c (Å)

24.4

Cell parameters a/b or c/a

0.571

Cell parameters c/b

2.681

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volumne (ų)

1154.608

X-Ray Powder Diffraction

22.3(50),
11.0(100),
7.32(10),
5.48(10),
4.47(10),
3.17(30),
2.01(10)
XRD chart Brinrobertsite

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

Morphology

Anhedrale Körner in Aggregaten bis zu 0,02 mm Durchmesser. Einzelne Körner weniger als 1 μm.

Physical Properties

Hardness (Mohs)

1

Density (g/cm³)

2.37 (Original aus Mangel an reinem Material keine Dichte bestimmt)

2.37 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}

(Co-)Type locality

(Co-)Type locality

UK/Wales/Gwynedd/Bangor/Aber-Ogwen/Nant Ffrancon Formation

Preface

Name from

Dr. Brin Roberts, Birkbeck College, Universität von London, UK

Author (Name, Year)

Dong & Peacor & Merriman & Kamp, 2002

References

DONG, H., PEACOR, D.R., MERRIMAN, R.J. & KEMP, S.J. (2002): Brinrobertsite, a new RI interstratified pyrophyllite/smectite-like clay mineral: characterization and geological origin. Mineralogical Magazine 66, 605-617.

American Mineralogist 88 (2003), 931

Other languages

German

Brinrobertsit

Spanish

Brinrobertsita

French

Brinrobertsite

English

Brinrobertsite

Russian

Бринробертсит

Simplified Chinese

叶腊石间蒙皂石

Traditional Chinese

葉臘石間蒙皂石

CNMNC (IMA)-Number

IMA 1997-040

CNMNC symbol

Symbol

Brb

Locations with GPS information