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Hydrotalcite-2H

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Formula:
Mg
 
6
Al
 
2
(CO
 
3
)(OH)
 
16
· 4H
 
2
O
System:HexagonalColour:White, grey or pale ...
Lustre:Waxy, PearlyHardness:2
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.
A polytype of Hydrotalcite

Originally named manasseite, which was later recognised as a polytype of hydrotalcite and accordingly discredited (Mills et al., 2012).

Classification of Hydrotalcite-2H

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/E.02-10
Nickel-Strunz 10th (pending) edition ID:5.DA.45

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
Dana 8th edition ID:16b.6.1.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
6 : AmBn(XO3)pZqxH2O & with (m+n):p = 8:1
Hey's CIM Ref.:11.7.5

11 : Carbonates
7 : Carbonates of Al
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Type Occurrence of Hydrotalcite-2H

Type Locality:Amity, Town of Warwick, Orange Co., New York, USA
Year of Discovery:1940

Physical Properties of Hydrotalcite-2H

Lustre:Waxy, Pearly
Diaphaneity (Transparency):Transparent
Colour:White, grey or pale blue, brownish white.
Hardness (Mohs):2
Cleavage:Perfect
{0001}
Density (measured):2 - 2.1 g/cm3
Density (calculated):2 g/cm3

Crystallography of Hydrotalcite-2H

Crystal System:Hexagonal
Cell Parameters:a = 3.1Å, c = 15.32Å
Ratio:a:c = 1 : 4.942
Unit Cell Volume:V 127.50 ų (Calculated from Unit Cell)
Morphology:Massive. Foliated or contorted structure. Lamellar on {0001}.
X-Ray Powder Diffraction:
d-spacingIntensity
7.67 (100)
2.60 (50)
2.34 (40)
2.17 (40)
2.00 (40)
1.84 (60)
1.52 (30)

Optical Data of Hydrotalcite-2H

Type:Uniaxial (-)
RI values: nω = 1.524 nε = 1.510
Maximum Birefringence:δ = 0.014

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Hydrotalcite-2H

Formula:
Mg
 
6
Al
 
2
(CO
 
3
)(OH)
 
16
· 4H
 
2
O
Simplified for copy/paste:Mg6Al2(CO3)(OH)16·4H2O
Essential elements:Al, C, H, Mg, O
All elements listed in formula:Al, C, H, Mg, O

Relationship of Hydrotalcite-2H to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.DA.05Dypingite
Mg
 
5
(CO
 
3
)
 
4
(OH)
 
2
· 5H
 
2
O
5.DA.05Giorgiosite
Mg
 
5
(CO
 
3
)
 
4
(OH)
 
2
· 5-6H
 
2
O
5.DA.05Hydromagnesite
Mg
 
5
(CO
 
3
)
 
4
(OH)
 
2
· 4H
 
2
O
5.DA.05Widgiemoolthalite
Ni
 
5
(CO
 
3
)
 
4
(OH)
 
2
· 5H
 
2
O
5.DA.05UM1986-10-CO:ClHMgMnZn
Mg
 
5
(Zn,Mn)
 
3
(CO
 
3
)
 
2
(OH,Cl)
 
12
· H
 
2
O
5.DA.05UM1987-01-CO:HMgS
Mg
 
4
(CO
 
3
)
 
2
(OH)
 
2
· 6H
 
2
O ?
5.DA.10Artinite
Mg
 
2
(CO
 
3
)(OH)
 
2
· 3H
 
2
O
5.DA.10Indigirite
Mg
 
2
Al
 
2
(CO
 
3
)
 
4
(OH)
 
2
· 15H
 
2
O
5.DA.10Chlorartinite
Mg
 
2
(CO
 
3
)(OH)Cl · 2H
 
2
O
5.DA.15Otwayite
Ni
 
2
(CO
 
3
)(OH)
 
2
· H
 
2
O
5.DA.15Zaratite
Ni
 
3
(CO
 
3
)(OH)
 
4
· 4H
 
2
O
5.DA.20Kambaldaite
NaNi
 
4
(CO
 
3
)
 
3
(OH)
 
3
· 3H
 
2
O
5.DA.25Callaghanite
Cu
 
2
Mg
 
2
(CO
 
3
)(OH)
 
6
· 2H
 
2
O
5.DA.30Claraite
(Cu,Zn)
 
3
(CO
 
3
)(OH)
 
4
· 4H
 
2
O
5.DA.35Hydroscarbroite
Al
 
14
(CO
 
3
)
 
3
(OH)
 
36
· nH
 
2
O
5.DA.35Scarbroite
Al
 
5
(CO
 
3
)(OH)
 
13
· 5H
 
2
O
5.DA.40Caresite
Fe
2+
4
Al
 
2
(OH)
 
12
[CO
 
3
] · 3H
 
2
O
5.DA.40Quintinite
Mg
 
4
Al
 
2
(OH)
 
12
[CO
 
3
] · 3H
 
2
O
5.DA.40Charmarite
Mn
2+
4
Al
 
2
(OH)
 
12
[CO
 
3
] · 3H
 
2
O
5.DA.45Stichtite-2H
Mg
 
6
(Cr,Al)
 
2
(CO
 
3
)(OH)
 
16
· 4H
 
2
O
5.DA.45Brugnatellite
Mg
 
6
Fe
3+
 
(CO
 
3
)(OH)
 
13
· 4H
 
2
O
5.DA.45Chlormagaluminite
Mg
 
4
Al
 
2
(OH)
 
12
Cl
 
2
· 3H
 
2
O
5.DA.45Pyroaurite-2H
Mg
 
6
Fe
3+
2
(CO
 
3
)(OH)
 
16
· 4H
 
2
O
5.DA.45Zaccagnaite
Zn
 
4
Al
 
2
(OH)
 
12
[CO
 
3
] · 3H
 
2
O
5.DA.50Comblainite
Ni
 
4
Co
 
2
(OH)
 
12
[CO
 
3
] · 3H
 
2
O
5.DA.50Desautelsite
Mg
 
6
Mn
3+
2
(OH)
 
16
[CO
 
3
] · 4H
 
2
O
5.DA.50Hydrotalcite
Mg
 
6
Al
 
2
(OH)
 
16
[CO
 
3
] · 4H
 
2
O
5.DA.50Pyroaurite
Mg
 
6
Fe
3+
2
(OH)
 
16
[CO
 
3
] · 4H
 
2
O
5.DA.50Reevesite
Ni
 
6
Fe
3+
2
(OH)
 
16
(CO
 
3
) · 4H
 
2
O
5.DA.50Stichtite
Mg
 
6
Cr
 
2
(OH)
 
16
[CO
 
3
] · 4H
 
2
O
5.DA.50Takovite
Ni
 
6
Al
 
2
(OH)
 
16
[CO
 
3
] · 4H
 
2
O
5.DA.50UM1998-10-CO:CoHNi
Co
 
6
Fe
 
2
(CO
 
3
)(OH)
 
16
· 4H
 
2
O ?
5.DA.55Coalingite
Mg
 
10
Fe
3+
2
(OH)
 
24
[CO
 
3
] · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
11.7.1Scarbroite
Al
 
5
(CO
 
3
)(OH)
 
13
· 5H
 
2
O
11.7.2Hydroscarbroite
Al
 
14
(CO
 
3
)
 
3
(OH)
 
36
· nH
 
2
O
11.7.3Dawsonite
NaAlCO
 
3
(OH)
 
2
11.7.4Hydrotalcite
Mg
 
6
Al
 
2
(OH)
 
16
[CO
 
3
] · 4H
 
2
O
11.7.6Indigirite
Mg
 
2
Al
 
2
(CO
 
3
)
 
4
(OH)
 
2
· 15H
 
2
O
11.7.7Alumohydrocalcite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
· 3H
 
2
O
11.7.8Para-alumohydrocalcite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
· 6H
 
2
O
11.7.9Tunisite
NaCa
 
2
Al
 
4
(CO
 
3
)
 
4
(OH)
 
8
Cl
11.7.10Wermlandite
Mg
 
7
Al
 
2
(OH)
 
18
[Ca(H
 
2
O)
 
6
][SO
 
4
]
 
2
· 6H
 
2
O
11.7.11Montroyalite
Sr
 
4
Al
 
8
(CO
 
3
)
 
3
(OH,F)
 
26
· 10-11H
 
2
O
11.7.12Dresserite
BaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
· H
 
2
O
11.7.13Hydrodresserite
BaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
· 3H
 
2
O
11.7.14Strontiodresserite
(Sr,Ca)Al
 
2
(CO
 
3
)
 
2
(OH)
 
4
· H
 
2
O

Other Names for Hydrotalcite-2H

Synonyms:
Manasseite
Other Languages:
Anglo-Saxon:Hydrotalcite-2H
German:Manasseit
Spanish:Manasseita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Hydrotalcite-2H

Reference List:

- +
Frondel, C., 1940, MSA Programs and Abstracts, p. 6.

Frondel, C. (1941) American Mineralogist: 26: 295-315.

Palache, Charles, Harry Berman & Clifford Frondel (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 658-659.

American Mineralogist (1967): 52: 1040.

Clay and Clay Minerals (1987): 35: 401.

Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012) Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289-1336.

Internet Links for Hydrotalcite-2H

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Manasseite details from Handbook of Mineralogy (PDF)
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  • Localities for Hydrotalcite-2H

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Brazil
     
    • São Paulo
      • Cajati
    MinRec 15:261-270
    Bulgaria
     
    • Yambol Oblast
      • Tundzha Obshtina
    Marcus Vau Collection
    France
     
    • Languedoc-Roussillon
      • Pyrénées-Orientales
        • Prats de Mollo-La Preste (Prats de Molló-La Presta)
    Dubru. M, (1986) Pétrologie et géochimie du marbre à brucite et des borates associés au gisement de tungstène de Costabonne, (Pyrénées orientales, France) 930p
    Hungary
     
    • Pest Co.
      • Szentendre
        • Dunabogdány
    Harangi, S. et al. (2009): Dunabogdány: Zeolites, laccolith, contact zone, Field Trip 2, 9th September 2009. MinPet2009 field trip booklet, 17 pp.
    Norway
     
    • Buskerud
      • Modum
    Mike Scott S106109 from Cureton 1999 ID by R. Taylor
    Frondel, C. (1941): Constitution and polymorphism of the pyroaurite and sjögrenite groups. American Mineralogist. 26, 295-315. Mills et al (2012): Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine. 76(5), 1289–1336
    • Hordaland
      • Bergen
        • Arna
    Neumann, H. (1985): Norges Mineraler. Norges geologiske Undersøkelse Skrifter 68 p. 103
        • Fana
    Collection of Naturhistorisk Museum, Bergen, Norway; Selbekk R.S. (2010): Norges mineraler. En revidert utgave av Norges mineraler (Neumann 1985). Tapir-NGU-NHM. 552p (p.215)
        • Ytrebygda
    Knut Edvard Larsen collection MM # 2264
    Poland
     
    • Upper Silesia (Śląskie)
      • Zawiercie District
    Koszowska E., Salata D. 2001: Minerals of the hydrotalcite group in metasomatically altered carbonate rocks from Zawiercie, S Poland. Mineralogia Polonica, vol. 32, no 1, 69-84
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    Subbotin, R. P. L. V. V., & Pakhomovsky, Y. A. (1998). A new type of scandium mineralization in phoscorites and carbonatites of the Kovdor massif, Russia. Canadian Mineralogist 36:971-980.
    http://maurice.strahlen.org/kola/kovdor.htm
    [World of Stones 95:5-6, p64]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
          • Zlatoust
            • Kusinsk Fe-Ti-V-deposit
    Joe Cilen
    Sweden
     
    • Värmland
      • Filipstad
    No reference listed
    USA
     
    • New York
    John H. Betts (2009) "The minerals of New York City", Rocks & Minerals, 84, 204-240.
      • Orange Co.
        • Town of Warwick
    Frondel (1941)
    Mineral and/or Locality  
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