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Hydrotalcite

Pictures (15 Images total)

Hydrotalkit
Views (File:
1686921100
): 49
Hydrotalkit
Krustig strahlige orangefarbene Hydrotalkite. Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Kovdor/Zheleznyi Mine (Iron Mine), BB = 11 mm
Copyright: Klaus Schäfer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A041479, Donator: Hannes Rose
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Kovdor/Zheleznyi Mine (Iron Mine)
Mineral: Hydrotalcite
Image: 1686921100
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Hydrotalkit (SNr: A041479)

Krustig strahlige orangefarbene Hydrotalkite. Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Kovdor/Zheleznyi Mine (Iron Mine), BB = 11 mm
Collection: Lithothek der Münchener Micromounter
Copyright: Klaus Schäfer
Contribution: Münchener Micromounter 2023-06-16
Locality: Zheleznyi Mine (Iron Mine) / Kovdor / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland
Hydrotalkit
Views (File:
1179056038
): 4999
Hydrotalkit
Fundort: Sounion Mine No. 19 ("Chloridstollen"), Sounion, Lavrion, Attika, Griechenland
Copyright: Fritz Schreiber; Contribution: Erik
Location: Griechenland/Attika (Attikí, Attica)/East Attica/Lavreotiki/Lavrion (Laurion), Bergbaudistrikt/Sounion/Cato Sounio Minen/Sounion Mine Nr. 19 (Chloridstollen)
Mineral: Hydrotalcite
Image: 1179056038
Rating: 7.5 (votes: 2)
License: Usage for Mineralienatlas project only
Hydrotalkit

Fundort: Sounion Mine No. 19 ("Chloridstollen"), Sounion, Lavrion, Attika, Griechenland
Copyright: Fritz Schreiber
Contribution: Erik 2007-05-13
Locality: Sounion Mine Nr. 19 (Chloridstollen) / Cato Sounio Minen / Sounion / Lavrion (Laurion), Bergbaudistrikt / Lavreotiki / East Attica / Attika (Attikí, Attica) / Griechenland
Hydrotalkit
Views (File:
1239915140
): 5576
Hydrotalkit
Größe: 0,6 mm; Fundort: Borcola Pass (Cava del Passo della Borcola), Posina, Vicenza, Venetien (Veneto), Italien
Copyright: Matteo Chinellato; Contribution: Hg
Location: Italien/Venetien (Veneto), Region/Vicenza, Provinz/Posina/Borcola Pass (Cava del Passo della Borcola)
Mineral: Hydrotalcite
Image: 1239915140
Rating: 8 (votes: 2)
License: Usage for Mineralienatlas project only
Hydrotalkit

Größe: 0,6 mm; Fundort: Borcola Pass (Cava del Passo della Borcola), Posina, Vicenza, Venetien (Veneto), Italien
Copyright: Matteo Chinellato
Contribution: Hg 2009-04-16
Locality: Borcola Pass (Cava del Passo della Borcola) / Posina / Vicenza, Provinz / Venetien (Veneto), Region / Italien
Hydrotalkit
Views (File:
1410293188
): 2726
Hydrotalkit
Tafelige farblose Kristalle bilden dichte kristallpakete mit Phillipsit, BB = 4,2 mm , Fundort: Stradnerkogel Wilhelmsdorf Steiermark Österreich.
Copyright: Bebo; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A022295, Donator: Manfred Seitz
Location: Österreich/Steiermark/Südoststeiermark, Bezirk/Bad Gleichenberg/Merkendorf/Wilhelmsdorf/Stradnerkogel
Mineral: Hydrotalcite
Image: 1410293188
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Hydrotalkit (SNr: A022295)

Tafelige farblose Kristalle bilden dichte kristallpakete mit Phillipsit, BB = 4,2 mm , Fundort: Stradnerkogel Wilhelmsdorf Steiermark Österreich.
Collection: Lithothek der Münchener Micromounter
Copyright: Bebo
Contribution: Münchener Micromounter 2014-09-09
Locality: Stradnerkogel / Wilhelmsdorf / Merkendorf / Bad Gleichenberg / Südoststeiermark, Bezirk / Steiermark / Österreich
Hydrotalkit
Views (File:
1179056203
): 6012
Hydrotalkit
Fundort: Sounion Mine No. 19 ("Chloridstollen"), Sounion, Lavrion, Attika, Griechenland
Copyright: Fritz Schreiber; Contribution: Erik
Location: Griechenland/Attika (Attikí, Attica)/East Attica/Lavreotiki/Lavrion (Laurion), Bergbaudistrikt/Sounion/Cato Sounio Minen/Sounion Mine Nr. 19 (Chloridstollen)
Mineral: Hydrotalcite
Image: 1179056203
Rating: 6.67 (votes: 3)
License: Usage for Mineralienatlas project only
Hydrotalkit

Fundort: Sounion Mine No. 19 ("Chloridstollen"), Sounion, Lavrion, Attika, Griechenland
Copyright: Fritz Schreiber
Contribution: Erik 2007-05-13
Locality: Sounion Mine Nr. 19 (Chloridstollen) / Cato Sounio Minen / Sounion / Lavrion (Laurion), Bergbaudistrikt / Lavreotiki / East Attica / Attika (Attikí, Attica) / Griechenland

You find additional specimen at the Geolitho Museum

Collectors Summary

Color farblos, weiß
Streak color weiß
Hardness (Mohs) 2
Cleavages {???} vollkommen
Solubility +++ Säuren
Crystal System trigonal, R3m

Chemism

Chemical formula

Mg6Al2(CO3)(OH)16·4H2O

Chemical composition

Aluminium, Magnesium, Kohlenstoff, Sauerstoff, Wasserstoff

Unit weight: 603.9818344 u; Number of atoms in the formula: 56

Info

Empirical formula:

Mg6Al2(CO3)(OH)16·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

4.01

24

42.86

1.0079470

24.1907280
Carbon

C

1.99

1

1.79

12.0107800

12.0107800
Oxygen

O

60.93

23

41.07

15.9994300

367.9868900
Magnesium

Mg

24.14

6

10.71

24.3050600

145.8303600
Aluminium

Al

8.93

2

3.57

26.9815382

53.9630764

Analysis wt%

MgO : 39.84, Fe2O3 : 0.90, Al2O3 : 15.16, CO2 : 7.25, H2O : 36.83 (Ref: American Mineralogist 67)

Strunz 9th edition incl. updates

5.DA.50

5: Carbonate (Carbonate, Nitrate)
D: Carbonate mit weitere Anionen, mit H2O
A: Mit mittelgroßen [Kationen]
50:Hydrotalkit-Gruppe

Lapis Classification

V/E.03-010

V: NITRATE, CARBONATE UND BORATE
E: Wasserhaltige Carbonate, mit fremden Anionen
3: Hydrotalkit-Gruppe

Classification by Hölzel

5.DD.500

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
D: Carbonates (+Anions +Water)
D: Hydrotalcite Series
5: Pyroaurite-Group

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Hydrotalcite Supergroup  ⇒ Hydrotalcite Group

Optical Properties

Color

farblos, weiß

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.016
Birefringence chart\! Hydrotalcite title=Birefringence chart Hydrotalcite

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

1.511

RI value γ / ε

1.495

Ri mean

1.506

2V angle

Uniaxial (-)

Optical Data Luminescence

Color LW-UV (365nm)

  

gelblich weiß

Color SW-UV (254nm)

  

gelblich weiß

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

166

Space Group

R3m

Cell parameters a (Å)

6.13

Cell parameters b (Å)

-

Cell parameters c (Å)

46.15

Cell parameters a/b or c/a

7.529

Cell parameters c/b

-

Z

3

Volume (ų)

1501.839

Crystal structure

Elena S. Zhitova ; Sergey V. Krivovichev; Igor Pekov; H. Christopher Greenwell: Crystal chemistry of natural layered double hydroxides. 5. Single-crystal structure refinement of hydrotalcite, [Mg6Al2(OH)16](CO3)(H2O)4. Mineralogical Magazine Vol. 83, Nr. 2 (2019) S. 269-280.

X-Ray Powder Diffraction

7.63(100),
3.82(50),
2.56(10),
2.283(10),
1.941(10),
1.524(10),
1.495(10)
XRD chart Hydrotalcite

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

Polytypes

Hydrotalcite-2H

Mg6Al2(CO3)(OH)16·4H2O

hexagonal

P63/mmc

6/mmm

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

2

Density (g/cm³)

2.06

2.003 ( ρ calc. Mineralienatlas )

Cleavages

{???} vollkommen

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Norwegen/Buskerud, Provinz/Modum, Kommune/Snarum/Solvverkets Pyrit Mine

Type material

Neotyp: Museum für Naturkunde Berlin, Deutschland

Preface

Author (Name, Year)

Hochstetter, 1842

References

American Mineralogist 26 (1941), 295

IMA 15-J: Hydrotalcite neotypes Proposal 15-J is accepted, and the hydrotalcite samples MFN_MIN_1998_2751 and MFN_MIN_1998_2758, labelled by Gustav Rose and deposited at the Museum fü r Naturkunde Berlin, are defined as neotypes. The type locality is Snarum, Modum, Buskerud, Norway. CNMNC Newsletter No. 26, August 2015, page 947; Mineralogical Magazine, 79, 941 - 947.

Stuart J. Mills, Andrew G. Christy, and Ralf T. Schmitt: The creation of neotypes for hydrotalcite. Mineralogical Magazine Vol. 80 (2016) S. 1023-1029.

IMA group assignments

 
Hydrotalcite Supergroup
 
 
 

 
 
Hydrotalcite Group
 
 
 

 
 
 
Desautelsite
Mg6Mn3+2(CO3)(OH)16·4H2O
trigonal
R3m, R3m

 
 
 
Droninoite
Ni6Fe3+2Cl2(OH)16·4H2O
trigonal
R3m

 
 
 
Hydrotalcite
Mg6Al2(CO3)(OH)16·4H2O
trigonal
R3m

 
 
 
Iowaite
Mg6Fe3+2(OH)16Cl2·4H2O
trigonal
R3m

 
 
 
Kaznakhtite
Ni6Co3+2(CO3)(OH)16⋅4H2O
trigonal
R3

 
 
 
Meixnerite
Mg6Al2(OH)18·4H2O
trigonal
R3m

 
 
 
Pyroaurite-2H
Mg6Fe23+[(OH)16|CO3]·4H2O
hexagonal
P63/mmc

 
 
 
Pyroaurite-3R
Mg6Fe23+(CO3)(OH)16·4H2O
trigonal
R3m

 
 
 
Reevesite
Ni6Fe23+(CO3)(OH)16·4H2O
trigonal
R3m

 
 
 
Stichtite
Mg6Cr2(CO3)(OH)16·4H2O
trigonal
R3m

 
 
 
Takovite
Ni6Al2(CO3)(OH)16·4H2O
trigonal
R3m

 
 
 
Woodallite
Mg6(Cr,Fe3+)2(OH)16Cl2·4H2O
trigonal
R3m

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Actuality: 09. May 2025 - 13:07:33

Other languages

Spanish

Hidrotalquita

French

Hydrotalcite

English

Hydrotalcite

German

Hydrotalkit

Russian

Гидроталькит

Alternative Name

Hydrotalcit

Hydrotalcita

Volkermit

Volkermita

Volkermite

Völcknerit

Italian

Völcknerita

Völcknerita

Völcknerite

Völkernit

Italian

Völkernita

Völkernita

Völkernite

Japanese

ハイドロタルカイト

CNMNC (IMA)-Number

IMA 15-J

CNMNC symbol

Symbol

Htc

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 8SgWl_pC6USOfdE71Cs1DA
GUID (Global unique identifier) 971628F1-42FA-44E9-8E7D-D13BD42B350C
Database ID 1675