Mineralogy Database

Hydrotalcite Mineral Data

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General Hydrotalcite Information

Help on Chemical  Formula: Chemical Formula: Mg6Al2(CO3)(OH)16•4(H2O)
Help on Composition: Composition: Molecular Weight = 603.98 gm
   Magnesium  24.14 %  Mg   40.04 % MgO
   Aluminum    8.93 %  Al   16.88 % Al2O3
   Hydrogen    4.01 %  H    35.79 % H2O
   Carbon      1.99 %  C     7.29 % CO2
   Oxygen     60.93 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg6Al2(CO3)(OH)16•4(H2O)
Help on Environment: Environment: Secondary mineral in serpentinite. Dimorphous with manasseite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1842
Help on Locality: Locality: Snarum, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as a HYDROus mineral with a resemblance to talc.
Help on Name Pronunciation: Name Pronunciation: Hydrotalcite + Pronunciation Say HYDROTALCITE
Help on Synonym: Synonym: ICSD 6296
  PDF 41-1428
 

Hydrotalcite Image

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  Hydrotalcite

Comments: Pearly white foliated masses of hydrotalcite on serpentinite rock.
Location: Snarum, Vikersund, Buskerud, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hydrotalcite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:7.52854
Help on Cell Dimensions: Cell Dimensions: a = 6.13, c = 46.15, Z = 3; V = 1,501.84 Den(Calc)= 2.00
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.69(1), 3.88(0.7), 2.58(0.2),
 

Physical Properties of Hydrotalcite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.06
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Pearly
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Hydrotalcite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2583,KPDmeas= 0.2507,KC= 0.2521
Ncalc = 1.5 - 1.52
Help on Optical Data: Optical Data: Uniaxial (-), e=1.495-1.529, w=1.511-1.531, bire=0.0020-0.0160.
 

Calculated Properties of Hydrotalcite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.13 gm/cc
note: Specific Gravity of Hydrotalcite =2.06 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEHydrotalcite = 0.92 barns/electron
U=PEHydrotalcite x rElectron Density= 1.96 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hydrotalcite is Not Radioactive
 

Hydrotalcite Classification

Help on  Dana Class: Dana Class: 16b.06.02.01 (16b)Carbonates - Hydroxyl or Halogen
  (16b.06)Dana Type
  (16b.06.02)Sjorgrenite-Hydrotalcite Group (Hydrotalcite Subgroup:Rhombohedral)
 
16b.06.02.01 Hydrotalcite Mg6Al2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
16b.06.02.02 Stichtite Mg6Cr2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
16b.06.02.03 Pyroaurite Mg6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
16b.06.02.04 Desautelsite Mg6Mn2(CO3)(OH)16•4(H2O) R 3m or R 3m Trig
 
16b.06.02.05 Droninoite! Ni3FeCl(OH)8•2H2O R 3m, R 3m or R 32 Trig
Help on  Strunz Class: Strunz Class: 05.DA.50 05 - CARBONATES (NITRATES)
  05.D - Carbonates with Additional Anions, with H2O
  05.DA -With medium-sized cations
 
05.DA.50 Desautelsite Mg6Mn2(CO3)(OH)16•4(H2O) R 3m or R 3m Trig
 
05.DA.50 Comblainite Ni6Co2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Hydrotalcite Mg6Al2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Pyroaurite Mg6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Reevesite Ni6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Stichtite Mg6Cr2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Takovite Ni6Al2(OH)16(CO3,OH)•4(H2O) R 3m 3 2/m
 

Other Hydrotalcite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Hydrotalcite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Print or Cut-and-Paste your Hydrotalcite Specimen Label here :

Hydrotalcite

Mg6Al2(CO3)(OH)16•4(H2O)
Dana No: 16b.06.02.01 Strunz No: 05.DA.50
Locality:

 

Notes:

 

 
   
 


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