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
GUID
(UUID V4):
(UUID V4):
f391d146-d571-446f-abbd-0022dbf493ce
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 = 1.510
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Chemistry of Hydrotalcite-2H
Mindat Formula:
Mg6Al2(CO3)(OH)16 · 4H2O
Crystallography of Hydrotalcite-2H
Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/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
Associated Minerals Based on Photo Data:
2 photos of Hydrotalcite-2H associated with Hydrotalcite | Mg6Al2(CO3)(OH)16 · 4H2O |
1 photo 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 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 | 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.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.10 | Artinite | Mg2(CO3)(OH)2 · 3H2O |
5.DA.10 | Indigirite | Mg2Al2(CO3)4(OH)2 · 15H2O |
5.DA.10 | Chlorartinite | Mg2(CO3)(OH)Cl · 2H2O |
5.DA.15 | Otwayite | Ni2(CO3)(OH)2 · H2O |
5.DA.15 | Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
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 | Caresite | Fe2+4Al2(OH)12[CO3] · 3H2O |
5.DA.40 | Quintinite | Mg4Al2(OH)12(CO3) · 3H2O |
5.DA.40 | Charmarite | Mn2+4Al2(OH)12[CO3] · 3H2O |
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.45 | Stichtite-2H | Mg6(Cr,Al)2(CO3)(OH)16 · 4H2O |
5.DA.45 | Brugnatellite | Mg6Fe3+(CO3)(OH)13 · 4H2O |
5.DA.45 | Chlormagaluminite | Mg4Al2(OH)12Cl2 · 3H2O |
5.DA.45 | Pyroaurite-2H | Mg6Fe3+2(OH)16(CO3) · 4H2O |
5.DA.45 | Zaccagnaite | Zn4Al2(OH)12[CO3] · 3H2O |
5.DA.45 | Liudongshengite | Zn4Cr2(OH)12(CO3) · 3H2O |
5.DA.50 | Comblainite | Ni4Co2(OH)12[CO3] · 3H2O |
5.DA.50 | Desautelsite | Mg6Mn3+2(OH)16[CO3] · 4H2O |
5.DA.50 | Hydrotalcite | Mg6Al2(CO3)(OH)16 · 4H2O |
5.DA.50 | Pyroaurite | Mg6Fe3+2(OH)16[CO3] · 4H2O |
5.DA.50 | Reevesite | Ni6Fe3+2(OH)16(CO3) · 4H2O |
5.DA.50 | Stichtite | Mg6Cr3+2(OH)16[CO3] · 4H2O |
5.DA.50 | Takovite | Ni6Al2(OH)16[CO3] · 4H2O |
5.DA.50 | Kaznakhtite | Ni6Co3+2(CO3)(OH)16 · 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
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
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Brazil | |
| Menezes et al. (1984) |
Oliveira et al. (2020) | |
Bulgaria | |
| Marcus Vau Collection |
Czech Republic | |
| Houzar et al. (2008) |
France | |
| Dubru. M (1986) |
Hungary | |
| Harangi (2009) |
Norway | |
| Henrich Neumann (1985) |
| Collection of Naturhistorisk Museum +1 other reference |
| Knut Edvard Larsen collection MM # 2264 |
| Mike Scott S106109 from Cureton 1999 ID ... |
Mills et al (2012) +1 other reference | |
Poland | |
| Koszowska E. |
Russia | |
| Joe Cilen |
| Subbotin et al. (1998) |
maurice.strahlen.org (2003) | |
[World of Stones 95:5-6 +2 other references | |
| Antonov A.A. [Антонов А.А.] (2003) |
Sweden | |
| Kjell Gatedal collection and ... |
USA | |
| John H. Betts (2009) |
| Frondel (1941) |
Dypingdal serpentine-magnesite deposit, Snarum, Modum, Viken, Norway