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Hydrotalcite-2H

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Formula:
Mg6Al2(CO3)(OH)16 · 4H2O
System:
Hexagonal
Colour:
White, grey or pale ...
Lustre:
Waxy, Pearly
Hardness:
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

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
5.DA.45

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
11.7.5

11 : Carbonates
7 : Carbonates of Al
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First Recorded Occurrence of Hydrotalcite-2H

Year of Discovery:
1940

Physical Properties of Hydrotalcite-2H

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

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 Data:
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
Max Birefringence:
δ = 0.014
Image 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:
Mg6Al2(CO3)(OH)16 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Hydrotalcite-2H to other Species

5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2O
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2O
5.DA.05UM1986-10-CO:ClHMgMnZnMg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.05UM1987-01-CO:HMgSMg4(CO3)2(OH)2 · 6H2O ?
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2O
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2O
5.DA.15OtwayiteNi2(CO3)(OH)2 · H2O
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2O
5.DA.25CallaghaniteCu2Mg2(CO3)(OH)6 · 2H2O
5.DA.30Claraite(Cu,Zn)3(CO3)(OH)4 · 4H2O
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2O
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2O
5.DA.40CaresiteFe42+Al2(OH)12[CO3] · 3H2O
5.DA.40QuintiniteMg4Al2(OH)12[CO3] · 3H2O
5.DA.40CharmariteMn42+Al2(OH)12[CO3] · 3H2O
5.DA.45Stichtite-2HMg6(Cr,Al)2(CO3)(OH)16 · 4H2O
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2O
5.DA.45Pyroaurite-2HMg6Fe23+(CO3)(OH)16 · 4H2O
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2O
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2O
5.DA.50DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
5.DA.50HydrotalciteMg6Al2(OH)16[CO3] · 4H2O
5.DA.50PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
5.DA.50ReevesiteNi6Fe23+(OH)16(CO3) · 4H2O
5.DA.50StichtiteMg6Cr2(OH)16[CO3] · 4H2O
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2O
5.DA.50UM1998-10-CO:CoHNiCo6Fe2(CO3)(OH)16 · 4H2O ?
5.DA.55CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
11.7.1ScarbroiteAl5(CO3)(OH)13 · 5H2O
11.7.2HydroscarbroiteAl14(CO3)3(OH)36 · nH2O
11.7.3DawsoniteNaAlCO3(OH)2
11.7.4HydrotalciteMg6Al2(OH)16[CO3] · 4H2O
11.7.6IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
11.7.7AlumohydrocalciteCaAl2(CO3)2(OH)4 · 4H2O
11.7.8Para-alumohydrocalciteCaAl2(CO3)2(OH)4 · 6H2O
11.7.9TunisiteNaCa2Al4(CO3)4(OH)8Cl
11.7.10WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O
11.7.11MontroyaliteSr4Al8(CO3)3(OH,F)26 · 10-11H2O
11.7.12DresseriteBaAl2(CO3)2(OH)4 · H2O
11.7.13HydrodresseriteBaAl2(CO3)2(OH)4 · 3H2O
11.7.14Strontiodresserite(Sr,Ca)Al2(CO3)2(OH)4 · H2O

Other Names for Hydrotalcite-2H

Name in Other Languages:
Anglo-Saxon:Hydrotalcite-2H
German:Manasseit
Spanish:Manasseita

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.

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

Localities for Hydrotalcite-2H

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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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