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Halloysite (Halloysit)

Pictures (5 Images total)

Halloysit-7A
Views (File:
1180811066
): 2471, Rating: 8.25
Halloysit-7A
Bildbreite: 3 mm; Fundort: Laacher See-Vulkangebiet, Eifel, Deutschland
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Deutschland/Rheinland-Pfalz/Ahrweiler, Landkreis/Brohltal, Verbandsgem./Laacher See
Mineral: Halloysite
Image: 1180811066
Rating: 8.25 (votes: 4)
License: Usage for Mineralienatlas project only
Halloysit-7A

Bildbreite: 3 mm; Fundort: Laacher See-Vulkangebiet, Eifel, Deutschland

Copyright: Stephan Wolfsried
Contribution: Hg 2007-06-02
Locality: Laacher See / Brohltal, Verbandsgem. / Ahrweiler, Landkreis / Rheinland-Pfalz / Deutschland
Halloysit-7Å mit Olivenit-Büschel
Views (File:
1154348923
): 2304
Halloysit-7Å mit Olivenit-Büschel
Fundort Mina La Farola, Atacama, Chile
Copyright: JHM; Contribution: Hg
Collection: Hg
Location: Chile/Atacama, Region (III. Region)/Copiapó, Provinz/Tierra Amarilla/Mina La Farola
Mineral: Halloysite, Olivenite
Image: 1154348923
Rating: 7 (votes: 2)
License: Usage for Mineralienatlas project only
Halloysit-7Å mit Olivenit-Büschel

Fundort Mina La Farola, Atacama, Chile

Collection: Hg
Copyright: JHM
Contribution: Hg 2006-07-31
Locality: Mina La Farola / Tierra Amarilla / Copiapó, Provinz / Atacama, Region (III. Region) / Chile
Halloysit mit Atacamit
Views (File:
1154348238
): 1837
Halloysit mit Atacamit
Bildbreite: 5 mm; Fondort Minan La Farola Chile, Atacama, Chile
Copyright: JHM; Contribution: Hg
Collection: Hg
Location: Chile/Atacama, Region (III. Region)/Copiapó, Provinz/Tierra Amarilla/Mina La Farola
Mineral: Halloysite
Image: 1154348238
License: Usage for Mineralienatlas project only
Halloysit mit Atacamit

Bildbreite: 5 mm; Fondort Minan La Farola Chile, Atacama, Chile

Collection: Hg
Copyright: JHM
Contribution: Hg 2006-07-31
Locality: Mina La Farola / Tierra Amarilla / Copiapó, Provinz / Atacama, Region (III. Region) / Chile
Halloysit
Views (File:
1529091983
): 1047
Halloysit
Eigenfund Türkisgraben
Copyright: ChristianT; Contribution: ChristianT
Collection: ChristianT
Location: Österreich/Niederösterreich/Krems-Land, Bezirk/Mühldorf, Marktgemeinde/Amstall
Mineral: Halloysite
Image: 1529091983
License: Usage for Mineralienatlas project only
Halloysit

Eigenfund Türkisgraben

Collection: ChristianT
Copyright: ChristianT
Contribution: ChristianT 2018-06-15
Locality: Amstall / Mühldorf, Marktgemeinde / Krems-Land, Bezirk / Niederösterreich / Österreich
Halloysit
Views (File:
1529092057
): 976
Halloysit
Eigenfund Türkisgraben
Copyright: ChristianT; Contribution: ChristianT
Collection: ChristianT
Location: Österreich/Niederösterreich/Krems-Land, Bezirk/Mühldorf, Marktgemeinde/Amstall
Mineral: Halloysite
Image: 1529092057
License: Usage for Mineralienatlas project only
Halloysit

Eigenfund Türkisgraben

Collection: ChristianT
Copyright: ChristianT
Contribution: ChristianT 2018-06-15
Locality: Amstall / Mühldorf, Marktgemeinde / Krems-Land, Bezirk / Niederösterreich / Österreich

Collectors Summary

Color weiß, gelblich weiß, rötlichweiß, bräunlich weiß, grünlichweiß
Streak color weiß
Hardness (Mohs) 1 - 2
Solubility +++ Säuren
Crystal System monoklin, Cc

Chemism

Chemical formula

Al2Si2O5(OH)4

Chemical composition

Aluminium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 258.1607944 u; Number of atoms in the formula: 17

Info

Empirical formula:

Al2Si2O5(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.56

4

23.53

1.0079470

4.0317880

Oxygen

O

55.78

9

52.94

15.9994300

143.9948700

Aluminium

Al

20.90

2

11.76

26.9815382

53.9630764

Silicon

Si

21.76

2

11.76

28.0855300

56.1710600

Strunz 9th edition incl. updates

9.ED.10

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
D: Schichtsilikate (Phyllosilikate) mit [Kaolinit]-Schichten, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
10:Halloysit-Gruppe

Classification by Hölzel

9.EO.110

9: SILICATES
E: Phyllosilicates
O: Halloysite-Group

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Kaolinite-Serpentine Group  ⇒ Kaolinite Subgroup

Optical Properties

Color

weiß, gelblich weiß, rötlichweiß, bräunlich weiß, grünlichweiß

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend bis opak

max. Birefringence

0.006

Birefringence chart\! Halloysite title=Birefringence chart Halloysite

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

1.559

RI value β

1.564

RI value γ / ε

1.565

Ri mean

1.563

2V angle

Biaxial (-) 37°

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

monoklin

Class (H-M)

m

Space Group number

9

Space Group

Cc

Cell parameters a (Å)

5.125

Cell parameters b (Å)

-

Cell parameters c (Å)

7.30

Cell parameters a/b or c/a

1.424

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

1

Volumne (ų)

166.1

X-Ray Powder Diffraction

7.42(100),
4.47(100),
3.63(100),
2.56(50),
2.48(50),
2.35(50),
1.67(30),
1.48(50)

XRD chart Halloysite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

1 - 2

Density (g/cm³)

2.55 - 2.65 / Durchschnittlich = 2.59 (gemessen)

2.581 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

Preface

Author (Name, Year)

Berthier, 1826

References

American Mineralogist 39 (1954), 97.

American Mineralogist 40 (1955), 1110.

Acta Crystallographica B31 (1975), 2851.

Clays and Clay Minerals 26 (1978), 25.

Powder Diffraction 4 (1989), 19.

Clays and Clay Minerals 39 (1991), 113.

Handbook of Mineralogy (Anthony u.w.), 2 (1995), 311.

IMA group assignments

Other languages

German

Halloysit

umbenannt; CNMNC Newsletter 69; Mineralogical Magazine, 86

English

Halloysite

renamed; CNMNC Newsletter 69; Mineralogical Magazine, 86

old name

German

Halloysit-7Å

umbenannt; CNMNC Newsletter 69; Mineralogical Magazine, 86

Spanish

Halloysita-7Å

French

Halloysite-7Å

English

Halloysite-7Å

renamed; CNMNC Newsletter 69; Mineralogical Magazine, 86

Alternative Name

Halloysite-77

CNMNC symbol

Symbol

Hly-7Å

Locations with GPS information