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Hydrotalcite-2H

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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.
A polytype of Hydrotalcite

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


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Classification of Hydrotalcite-2HHide

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

Physical Properties of Hydrotalcite-2HHide

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

Optical Data of Hydrotalcite-2HHide

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-2HHide

Formula:
Mg6Al2(CO3)(OH)16 · 4H2O

Crystallography of Hydrotalcite-2HHide

Crystal System:
Hexagonal
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 DiffractionHide

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)

First Recorded Occurrence of Hydrotalcite-2HHide

Synonyms of Hydrotalcite-2HHide

Other Language Names for Hydrotalcite-2HHide

Anglo-Saxon:Hydrotalcite-2H
German:Manasseit
Spanish:Manasseita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hydrotalcite2 photos of Hydrotalcite-2H associated with Hydrotalcite on mindat.org.
Magnesite1 photo of Hydrotalcite-2H associated with Magnesite on mindat.org.
Quintinite1 photo of Hydrotalcite-2H associated with Quintinite on mindat.org.
Lizardite1 photo of Hydrotalcite-2H associated with Lizardite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.DA.AlexkhomyakoviteK6(Ca2Na)(CO3)5Cl·6H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2OMon.
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2OMon.
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2OMon.
5.DA.05UM1986-10-CO:ClHMgMnZnMg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.05UM1987-01-CO:HMgSMg4(CO3)2(OH)4 · 6H2O ?Mon.
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2OMon.
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2OTrig. 3m : R3c
5.DA.15OtwayiteNi2(CO3)(OH)2 · H2OOrth.
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O ?Iso.
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2OHex.
5.DA.25CallaghaniteCu2Mg2(CO3)(OH)6 · 2H2OMon.
5.DA.30Claraite(Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14·7H2OTric.
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2OTric.
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2OHex.
5.DA.40CaresiteFe2+4Al2(OH)12[CO3] · 3H2OTrig.
5.DA.40QuintiniteMg4Al2(OH)12[CO3] · 3H2OHex. 6 2 2 : P63 2 2
5.DA.40CharmariteMn2+4Al2(OH)12[CO3] · 3H2O
5.DA.45Stichtite-2HMg6(Cr,Al)2(CO3)(OH)16 · 4H2OHex.
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2OHex.
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2OHex.
5.DA.45Pyroaurite-2HMg6Fe3+2(OH)16(CO3) · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2OHex.
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2OTrig.
5.DA.50DesautelsiteMg6Mn3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m)
5.DA.50HydrotalciteMg6Al2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2OTrig.
5.DA.50StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.
5.DA.50UM1998-10-CO:CoHNiCo6Fe2(CO3)(OH)16 · 4H2O ?
5.DA.55CoalingiteMg10Fe3+2(OH)24[CO3] · 2H2OTrig.

Related Minerals - Dana Grouping (8th Ed.)Hide

16b.6.1.2Stichtite-2HMg6(Cr,Al)2(CO3)(OH)16 · 4H2OHex.
16b.6.1.3Pyroaurite-2HMg6Fe3+2(OH)16(CO3) · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
16b.6.1.4ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2OHex.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.7.1ScarbroiteAl5(CO3)(OH)13 · 5H2OHex.
11.7.2HydroscarbroiteAl14(CO3)3(OH)36 · nH2OTric.
11.7.3DawsoniteNaAlCO3(OH)2Orth. mmm (2/m 2/m 2/m) : Imma
11.7.4HydrotalciteMg6Al2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
11.7.6IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
11.7.7AlumohydrocalciteCaAl2(CO3)2(OH)4 · 4H2OTric. 1 : P1
11.7.8Para-alumohydrocalciteCaAl2(CO3)2(OH)4 · 6H2O
11.7.9TunisiteNaCa2Al4(CO3)4(OH)8ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
11.7.10WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2OTrig. 3m (3 2/m) : P3c1
11.7.11MontroyaliteSr4Al8(CO3)3(OH,F)26 · 10-11H2O
11.7.12DresseriteBaAl2(CO3)2(OH)4 · H2OOrth. mmm (2/m 2/m 2/m)
11.7.13HydrodresseriteBaAl2(CO3)2(OH)4 · 3H2OTric.
11.7.14StrontiodresseriteSrAl2(CO3)2(OH)4 · H2OOrth.

Other InformationHide

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-2HHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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-2HHide

Localities for Hydrotalcite-2HHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil
 
  • São Paulo
    • Cajati
MinRec 15:261-270
Bulgaria
 
  • Yambol Oblast
    • Tundzha Obshtina
Marcus Vau Collection
France
 
  • Occitanie
    • 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
    • Murmanskaya Oblast'
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
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Asbest
Antonov A.A. [Антонов А.А.] (2003): Mineralogy of rodingites of the Bazhenovsk ultrabasic massif [Минералогия родингитов Баженовского гипербазитого массива]. Nauka, Sankt-Peterburg, 129 pp. (in Russian).
    • 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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