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Hydrotalcite-3R

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Formula:
Mg6Al2(CO3)(OH)16 · 4H2O
Specific Gravity:
2.00 (Calculated)
Crystal System:
Trigonal
Name:
Named as a polytype of hydrotalcite by Mills et al. (2012).
A polytype of Hydrotalcite

Hydrotalcite from the type location at Snarum, Norway, is dominated by the 3R polytype (Mills et al., 2016).


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Physical Properties of Hydrotalcite-3RHide

Density:
2.00 g/cm3 (Calculated)

Chemical Properties of Hydrotalcite-3RHide

Formula:
Mg6Al2(CO3)(OH)16 · 4H2O

Crystallography of Hydrotalcite-3RHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3 2/m
Cell Parameters:
a = 6.13 Å, c = 46.15 Å
Ratio:
a:c = 1 : 7.529
Unit Cell V:
1501.84 ų
Z:
3

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.69 (100)
3.88 (70)
2.58 (20)
2.30 (20)
1.96 (20)
1.53 (20)
1.50 (20)

Relationship of Hydrotalcite-3R to other SpeciesHide

Other Members of this group:
DesautelsiteMg6Mn3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m)
DroninoiteNi6Fe2+3(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
HydrotalciteMg6Al2(CO3)(OH)16 · 4H2OTrig. 3m (3 2/m) : R3m
IowaiteMg6Fe3+2(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
MeixneriteMg6Al2(OH)16(OH)2 · 4H2OTrig. 3m (3 2/m) : R3m
PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2OTrig.
StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.
WoodalliteMg6Cr2(OH)16Cl2 · 4H2OTrig.

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-3RHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Mills, S.J., Christy, A.G., Schmitt, R.T. (2016): The creation of neotypes for hydrotalcite. Mineralogical Magazine: 80 (in press).

Internet Links for Hydrotalcite-3RHide

Mineral and/or Locality  
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