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Magnesio-hornblende group

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Formula:
☐(Ca
 
2
)(Z
2+
4
Z
3+
 
}(AlSi
 
7
O
 
22
)(OH,F,Cl)
 
2
Member of:Calcium Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Name:Defined in the 2012 amphibole nomenclature


The group is defined as amphiboles in the calcium amphibole subgroup with A(Na+K+2Ca)≤0,5 apfu and 0,5≤Z(Al + Fe3+ +2Ti)≤1,5 apfu. The individual members of the group are defined by it's dominant elements in the Z and W positions


Z2+ position (= IMA C2+ position): Mg or Fe2+
Z3+ position (= IMA C3+ position): Al or Fe3+
W position: (OH) or F

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.

The magnesio-hornblende group is an IMA-CNMNC defined amphibole root-name group with strict chemical boundaries. it should not be confused with the more loosely defined "hornblende", which is a term used by petrologists and mineral collectors for any black undefined amphibole in the calcium ( and sometimes in the sodium-calcium) subgroups.

Classification of Magnesio-hornblende group

IMA status:Approved 2012
mindat.org URL:http://www.mindat.org/min-8789.html
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Chemical Properties of Magnesio-hornblende group

Formula:
☐(Ca
 
2
)(Z
2+
4
Z
3+
 
}(AlSi
 
7
O
 
22
)(OH,F,Cl)
 
2
Simplified for copy/paste:☐(Ca2)(Z2+4Z3+}(AlSi7O22)(OH,F,Cl)2

Relationship of Magnesio-hornblende group to other Species

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

- +
Cannilloite group
Ca(Ca
 
2
)(Z
2+
4
Z
3+
 
))(Al
 
3
Si
 
5
O
 
22
)(OH,F,Cl)
 
2
Edenite Group
A(Ca
 
2
)Z
 
5
(AlSi
 
7
O
 
22
)((OH,F,Cl)
 
2
Hastingsite Group
(A)(Ca
 
2
){Z
2+
4
Fe
3+
 
)(Al
 
2
Si
 
6
O
 
22
)(OH,F,Cl)
 
2
Joesmithite
{Pb}{Ca
 
2
}{Mg
 
3
Fe
3+
2
}(Be
 
2
Si
 
6
O
 
22
)(OH)
 
2
Pargasite Group
(A)(Ca
 
2
){Z
2+
4
Al)(Al
 
2
Si
 
6
O
 
22
)(OH,F,Cl)
 
2
Sadanagaite Group
A (Ca
 
2
)(Z
2+
3
Z
3+
2
)(Al
 
3
Si
 
5
O
 
22
)(OH,F,Cl)
 
2
Tremolite-actinolite group
☐{Ca
 
2
}{Z
 
5
}(Si
 
8
O
 
22
)(OH,F,Cl)
 
2
Tschermakite Group
☐(Ca
 
2
)(Z
2+
3
Z
3+
2
}(Al
 
2
Si
 
6
O
 
22
)(OH,F,Cl)
 
2
Group Members:
Ferro-ferri-fluoro-hornblende
☐{Ca
 
2
}{Fe
2+
4
Fe
3+
 
}(AlSi
 
7
O
 
22
)F
 
2
Ferro-ferri-hornblende
☐{Ca
 
2
}{Fe
3+
4
Fe
3+
 
}(AlSi
 
7
O
 
22
)(OH)
 
2
Ferro-fluoro-hornblende
☐{Ca
 
2
}{Fe
2+
4
Al}(AlSi
 
7
O
 
22
)F
 
2
Ferro-hornblende
☐{Ca
 
2
}{Fe
2+
4
Al}(AlSi
 
7
O
 
22
)(OH)
 
2
Magnesio-ferri-fluoro-hornblende
☐{Ca
 
2
}{Mg
 
4
Fe
3+
 
}(AlSi
 
7
O
 
22
)F
 
2
Magnesio-ferri-hornblende
☐{Ca
 
2
}{Mg
 
4
Fe
3+
 
}(AlSi
 
7
O
 
22
)(OH)
 
2
Magnesio-fluoro-hornblende
(Na,K)
 
1-x
Ca
 
2
Mg
 
5
(Si
 
7
Al)O
 
22
F
 
2
Magnesio-hornblende
☐{Ca
 
2
}{Mg
 
4
Al}(AlSi
 
7
O
 
22
)(OH)
 
2
Chemically related to group(s):
Tschermakite Group
☐(Ca
 
2
)(Z
2+
3
Z
3+
2
}(Al
 
2
Si
 
6
O
 
22
)(OH,F,Cl)
 
2

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 Magnesio-hornblende group

Reference List:

- +
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 Magnesio-hornblende group

Best of Species:Magnesio-hornblende group

Internet Links for Magnesio-hornblende group

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  • Localities for Magnesio-hornblende group

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