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Hydrotalcite Group

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Big Photo

Pyroaurite
Wood's Chrome Mine (Wood's Mine), Texas, Little Britain Township, Lancaster Co., Pennsylvania, USA
© 2011, JGW

Show Hydrotalcite Group Photos (218)



Formula:
Mg
 
6
R
3+
2
(OH)
 
16
CO
 
3
·4H
 
2
O, where R
3+
 
 = Al, Cr, or Fe


Structurally layer-lattices based on a stacking of hydroxide layers along [0001], as in brucite.

See also the related Manasseite Group.

Classification of Hydrotalcite Group

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Chemical Properties of Hydrotalcite Group

Formula:
Mg
 
6
R
3+
2
(OH)
 
16
CO
 
3
·4H
 
2
O, where R
3+
 
 = Al, Cr, or Fe

Relationship of Hydrotalcite Group to other Species

Group Members:
Desautelsite
Mg
 
6
Mn
3+
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
Hydrotalcite
Mg
 
6
Al
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
Hydrowoodwardite
(Cu,Al)
 
9
(SO
 
4
)
 
2
(OH)
 
18
 · nH
 
2
O
Iowaite
Mg
 
6
Fe
3+
2
(OH)
 
16
Cl
 
2
 · 4H
 
2
O
Pyroaurite
Mg
 
6
Fe
3+
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
Stichtite
Mg
 
6
Cr
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
Takovite
Ni
 
6
Al
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
Wermlandite
Mg
 
7
(Ca,Mg)(Al,Fe)
 
2
(SO
 
4
)
 
2
(OH)
 
18
 · 12H
 
2
O
Woodwardite
Cu
 
4
Al
 
2
(SO
 
4
)(OH)
 
12
 · 2-4H
 
2
O
Zaccagnaite
Zn
 
4
Al
 
2
(CO
 
3
)(OH)
 
12
 · 3H
 
2
O
Zincowoodwardite
Zn
 
1-x
Al
 
x
(SO
 
4
)
 
x/2
(OH)
 
2
 · nH
 
2
O (x=0.32-0.50)

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 Group

Reference List:

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

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: 653.

Internet Links for Hydrotalcite Group

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  • Rare and Unusual minerals at Mineralogical Research Company
  • Edwards Minerals - Fine Specimens
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    • Localities for Hydrotalcite Group

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    Locality Updated: Ishpeming, Marquette iron range, Marquette Co., Michigan, USAFrom Peter Cristofono, 14th Feb 2012 03:41:55