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Riebeckite Group

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Big Photo

Magnesio-riebeckite
Alto Chapare District, Chapare Province, Cochabamba Department, Bolivia
© AsbestosMinerals.com

Show Riebeckite Group Photos (91)



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.

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

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Internet Links for Riebeckite Group

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    • Localities for Riebeckite Group

    The 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.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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    Locality Updated: VC Quarry, Isle of Lundy, North Devon, Devon, England, UKFrom David Ifold, 20th Jun 2013 10:51:41