Hydrotalcite-2H
A structural variant of Hydrotalcite
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About Hydrotalcite-2H
Formula:
Mg6Al2(CO3)(OH)16 · 4H2O
Colour:
White, grey or pale blue, brownish white.
Lustre:
Waxy, Pearly
Hardness:
2
Specific Gravity:
2 - 2.1
Crystal System:
Hexagonal
Name:
Renamed as a polytype of hydrotalcite in 2012. The original name, manasseite, was named by Clifford Frondel in 1940 in honor of Ernesto Manasse [1875-1922], Professor of Mineralogy, University of Florence [Firenze], Italy.
First Recorded Locality:
A polytype of Hydrotalcite
Originally named manasseite, which was later recognised as a polytype of hydrotalcite and accordingly discredited (Mills et al., 2012).
Originally named manasseite, which was later recognised as a polytype of hydrotalcite and accordingly discredited (Mills et al., 2012).
Unique Identifiers
Mindat ID:
2560
Long-form identifier:
mindat:1:1:2560:3
Classification of Hydrotalcite-2H
5.DA.45
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
16b.6.1.1
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
6 : AmBn(XO3)pZqxH2O & with (m+n):p = 8:1
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
6 : AmBn(XO3)pZq
11.7.5
11 : Carbonates
7 : Carbonates of Al
11 : Carbonates
7 : Carbonates of Al
Physical Properties of Hydrotalcite-2H
Waxy, Pearly
Transparency:
Transparent
Colour:
White, grey or pale blue, brownish white.
Hardness:
2 on Mohs scale
Cleavage:
Perfect
{0001}
{0001}
Density:
2 - 2.1 g/cm3 (Measured) 2 g/cm3 (Calculated)
Optical Data of Hydrotalcite-2H
Type:
Uniaxial (-)
RI values:
nω = 1.524 nε = 1.51
Max. Birefringence:
δ = 0.014
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Chemistry of Hydrotalcite-2H
Mindat Formula:
Mg6Al2(CO3)(OH)16 · 4H2O
Element Weights:
Crystallography of Hydrotalcite-2H
Crystal System:
Hexagonal
Class (H-M):
6/mmm(6/m2/m2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Cell Parameters:
a = 3.1 Å, c = 15.32 Å
Ratio:
a:c = 1 : 4.942
Unit Cell V:
127.50 ų (Calculated from Unit Cell)
Morphology:
Massive. Foliated or contorted structure. Lamellar on {0001}.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.67 Å | (100) |
| 2.60 Å | (50) |
| 2.34 Å | (40) |
| 2.17 Å | (40) |
| 2.00 Å | (40) |
| 1.84 Å | (60) |
| 1.52 Å | (30) |
First Recorded Occurrence of Hydrotalcite-2H
Synonyms of Hydrotalcite-2H
Other Language Names for Hydrotalcite-2H
Common Associates
Associations Based on Photo Data:
| 2 photos of Hydrotalcite-2H associated with Hydrotalcite | Mg6Al2(CO3)(OH)16 · 4H2O |
| 2 photos of Hydrotalcite-2H associated with Magnesite | MgCO3 |
| 1 photo of Hydrotalcite-2H associated with Quintinite | Mg4Al2(OH)12(CO3) · 3H2O |
| 1 photo of Hydrotalcite-2H associated with Bobierrite | Mg3(PO4)2 · 8H2O |
| 1 photo of Hydrotalcite-2H associated with Calcite | CaCO3 |
| 1 photo of Hydrotalcite-2H associated with Dolomite | CaMg(CO3)2 |
| 1 photo of Hydrotalcite-2H associated with Lizardite | Mg3(Si2O5)(OH)4 |
| 1 photo of Hydrotalcite-2H associated with Gorceixite | BaAl3(PO4)(PO3OH)(OH)6 |
Related Minerals - Strunz-mindat Grouping
| 5.DA. | Alexkhomyakovite | K6(Ca2Na)(CO3)5Cl · 6H2O |
| 5.DA. | Amoraite | Ca12Al6(OH)36(CO3)2(SO3) · 15H2O |
| 5.DA.05 | Dypingite | Mg5(CO3)4(OH)2 · 5H2O |
| 5.DA.05 | 'UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995)' | Mg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O |
| 5.DA.05 | 'UM1987-01-CO:HMgS' | Mg4(CO3)2(OH)4 · 6H2O ? |
| 5.DA.05 | Giorgiosite | Mg5(CO3)4(OH)2 · 5-6H2O |
| 5.DA.05 | Hydromagnesite | Mg5(CO3)4(OH)2 · 4H2O |
| 5.DA.05 | Widgiemoolthalite | Ni5(CO3)4(OH)2 · 5H2O |
| 5.DA.10 | Artinite | Mg2(CO3)(OH)2 · 3H2O |
| 5.DA.10 | Chlorartinite | Mg2(CO3)(OH)Cl · 2H2O |
| 5.DA.10 | Indigirite | Mg2Al2(CO3)4(OH)2 · 15H2O |
| 5.DA.15 | Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
| 5.DA.15 | Otwayite | Ni2(CO3)(OH)2 · H2O |
| 5.DA.20 | Kambaldaite | NaNi4(CO3)3(OH)3 · 3H2O |
| 5.DA.25 | Callaghanite | Cu2Mg2(CO3)(OH)6 · 2H2O |
| 5.DA.30 | Claraite | (Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14 · 7H2O |
| 5.DA.35 | Hydroscarbroite | Al14(CO3)3(OH)36 · nH2O |
| 5.DA.35 | Scarbroite | Al5(CO3)(OH)13 · 5H2O |
| 5.DA.40 | Karchevskyite | Mg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5 |
| 5.DA.40 | 'UM1987-05-OH:AlCMg' | Mg4Al2(OH)12(CO3,SO4) · 3H2O |
| 5.DA.40 | Quintinite | Mg4Al2(OH)12(CO3) · 3H2O |
| 5.DA.40 | Charmarite | Mn2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.40 | Caresite | Fe2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | 'Stichtite-2H' | Mg6(Cr,Al)2(CO3)(OH)16 · 4H2O |
| 5.DA.45 | Brugnatellite | Mg6Fe3+(CO3)(OH)13 · 4H2O |
| 5.DA.45 | Zaccagnaite | Zn4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | 'Pyroaurite-2H' | Mg6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.45 | Liudongshengite | Zn4Cr2(OH)12(CO3) · 3H2O |
| 5.DA.45 | Chlormagaluminite | Mg4Al2(OH)12Cl2 · 3H2O |
| 5.DA.50 | Pyroaurite | Mg6Fe3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Takovite | Ni6Al2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Reevesite | Ni6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.50 | Kaznakhtite | Ni6Co3+2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Comblainite | Ni4Co2(OH)12[CO3] · 3H2O |
| 5.DA.50 | Marioantofilliite | [Cu4Al2(OH)12](CO3) · 3H2O |
| 5.DA.50 | Hydrotalcite | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Stichtite | Mg6Cr3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Desautelsite | Mg6Mn3+2(OH)16[CO3] · 4H2O |
| 5.DA.55 | Coalingite | Mg10Fe3+2(OH)24[CO3] · 2H2O |
| 5.DA.55 | Akopovaite | Al4Li2(OH)12(CO3)(H2O)3 |
| 5.DA.60 | Šlikite | Zn2Mg(CO3)2(OH)2 · 4H2O |
| 5.DA.65 | Marklite | Cu5(CO3)2(OH)6 · 6H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Hydrotalcite-2H
mindat.org URL:
https://www.mindat.org/min-2560.html
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Please feel free to link to this page.
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References for Hydrotalcite-2H
Reference List:
Frondel, Clifford (1941) Constitution and polymorphism of the pyroaurite and sjögrenite groups. American Mineralogist, 26 (5) 295-315
Brown, G., Gastuche, M. C. (1967) Mixed magnesium-aluminium hydroxides. II. Structure and structural chemistry of synthetic hydroxycarbonates and related minerals and compounds. Clay Minerals, 7 (2) 193-201 doi:10.1180/claymin.1967.007.2.06
Gastuche, M. C., Brown, G., Mortland, M. M. (1967) Mixed magnesium-aluminiun hydroxides. I. Preparation and characterization of compounds formed in dialysed systems. Clay Minerals, 7 (2) 177-192 doi:10.1180/claymin.1967.007.2.05
Drits, V. A., Sokolova, T. N., Sokolova, G. V., Cherkashin, V. I. (1987) New Members of the Hydrotalcite-Manasseite Group. Clays and Clay Minerals, 35 (6). 401-417 doi:10.1346/ccmn.1987.0350601
Mills, S. J.; Christy, A. G.; Génin, J.-M. R.; Kameda, T.; Colombo, F. (2012) Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76 (5). 1289-1336 doi:10.1180/minmag.2012.076.5.10
Localities for Hydrotalcite-2H
Showing 22 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Brazil | |
| Oliveira et al. (2020) |
| Menezes et al. (1984) | |
Bulgaria | |
| Marcus Vau Collection |
Czech Republic | |
| Houzar et al. (2008) |
France | |
| Dubru. M (1986) |
Germany | |
| Schnorrer et al. (1998) |
Hungary | |
| Harangi (2009) |
Norway | |
| Mike Scott S106109 from Cureton 1999 ID ... |
| Frondel (1941) +1 other reference | |
| Neumann (1985) |
| Collection of Naturhistorisk Museum +1 other reference |
| Knut Edvard Larsen collection MM # 2264 |
Poland | |
| Koszowska E. |
Russia | |
| Stepanov et al. (2024) |
| Joe Cilen |
| Liferovich et al. (1998) |
| maurice.strahlen.org (2003) | |
| [World of Stones 95:5-6 +1 other reference | |
| Антонов (2003) |
Sweden | |
| Gatedal (n.d.) |
USA | |
| John H. Betts (2009) |
| Frondel (1941) |
Dypingdal serpentine-magnesite deposit, Snarum, Modum, Buskerud, Norway