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Riebeckite Group

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Formula:
◻[Na
 
2
][Z
2+
3
Fe
3+
2
]Si
 
8
O
 
22
(OH,F,Cl)
 
2
The riebeckite group minerals are sodium amphiboles defined with A(Na+K+2Ca)< 0.5 apfu and 1.5 apfu < Z(Al+Fe3++2Ti) with Fe3+ as the dominant element in the Z3+ position (=IMA C3+ position)

The individual members of the group are defined by the dominant elements in the Z2+ and W positions. The most common dominant elements in the various positions are:
Z2+ position(=IMA C2+ position): Mg or Fe2+ dominant
W position: (OH) or F dominant

On mindat.org we avoid using variables with the same symbol as elements and deviate from the IMA nomenclaure in that we use X rather than B, Z rather than C and (OH,F,Cl,O) rather than W.
Member of:Sodium Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
This page provides mineralogical data about Riebeckite Group.

Classification of Riebeckite Group

IMA status:Approved 2012
mindat.org URL:http://www.mindat.org/min-8698.html
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Chemical Properties of Riebeckite Group

Formula:
◻[Na
 
2
][Z
2+
3
Fe
3+
2
]Si
 
8
O
 
22
(OH,F,Cl)
 
2


The riebeckite group minerals are sodium amphiboles defined with A(Na+K+2Ca)< 0.5 apfu and 1.5 apfu < Z(Al+Fe3++2Ti) with Fe3+ as the dominant element in the Z3+ position (=IMA C3+ position)

The individual members of the group are defined by the dominant elements in the Z2+ and W positions. The most common dominant elements in the various positions are:
Z2+ position(=IMA C2+ position): Mg or Fe2+ dominant
W position: (OH) or F dominant

On mindat.org we avoid using variables with the same symbol as elements and deviate from the IMA nomenclaure in that we use X rather than B, Z rather than C and (OH,F,Cl,O) rather than W.
Simplified for copy/paste:◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2

Relationship of Riebeckite Group to other Species

Member of:Sodium Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Other Members of Group:

- +
Arfvedsonite Group
ANa
 
2
(Z
2+
4
Fe
3+
 
}Si
 
8
O
 
22
(OH,F,Cl)
 
2
Eckermannite Group
ANa
 
2
(Z
2+
4
Al}Si
 
8
O
 
22
(OH,F,Cl)
 
2
Glaucophane Group
◻[Na
 
2
][Z
2+
3
Al
 
2
]Si
 
8
O
 
22
(OH,F,Cl)
 
2
Leakeite Group
ANa
 
2
(Z
2+
2
Z
3+
2
Li)(Si
 
8
O
 
22
)(OH,F,Cl)
 
2
Nybøite Group
ANa
 
2
(Z
2+
3
Z
3+
2
)(AlSi
 
7
O
 
22
)(OH,F,Cl)
 
2
Group Members:
Fluoro-riebeckite
◻{Na
 
2
}{Fe
2+
3
Fe
3+
2
}(Si
 
8
O
 
22
)F
 
2
Magnesio-fluoro-riebeckite
◻{Na
 
2
}{Mg
 
3
Fe
3+
2
}(Si
 
8
O
 
22
)F
 
2
Magnesio-riebeckite
◻{Na
 
2
}{Mg
 
3
Fe
3+
2
}(Si
 
8
O
 
22
)(OH)
 
2
Riebeckite
◻[Na
 
2
][Fe
2+
3
Fe
3+
2
]Si
 
8
O
 
22
(OH)
 
2

Other Names for Riebeckite Group

Varieties:
Cape AsbestosCrocidolite

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 Riebeckite Group

Reference List:

- +
Hawthorne, Frank C., and Roberta Oberti (2006), On the classification of amphiboles: Canadian Mineralogist:
44(1): 1-21.

Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch (2012): Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97, pages 2031–2048

Best Localities for Riebeckite Group

Best of Species:Riebeckite Group

Internet Links for Riebeckite Group

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  • Localities for Riebeckite Group

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