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Hornblende Root Name

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Formula:
☐(Ca2)(Z42+Z3+}(AlSi7O22)(OH,F,Cl)2
The hornblende root name is in a mineralogical sense 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 hornblende root name is an IMA-CNMNC defined amphibole root-name 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 Hornblende Root Name

Approved 2012
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Chemical Properties of Hornblende Root Name

Formula:
☐(Ca2)(Z42+Z3+}(AlSi7O22)(OH,F,Cl)2

Relationship of Hornblende Root Name to other Species

Other Members of Group:
Cannilloite Root NameCa(Ca2)(Z42+Z3+))(Al3Si5O22)(OH,F,Cl)2
Edenite Root NameA(Ca2)Z5(AlSi7O22)((OH,F,Cl)2
Hastingsite Root Name(A)(Ca2){Z42+ Fe3+)(Al2Si6O22)(OH,F,Cl)2
Joesmithite{Pb}{Ca2}{Mg3Fe23+}(Be2Si6O22)(OH)2
Pargasite Root Name(A)(Ca2){Z42+ Al)(Al2Si6O22)(OH,F,Cl)2
Sadanagaite Root NameA (Ca2)(Z32+Z23+)(Al3Si5O22)(OH,F,Cl)2
Tremolite-actinolite series☐{Ca2}{Z5}(Si8O22)(OH,F,Cl)2
Tschermakite Root Name☐(Ca2)(Z32+Z23+}(Al2Si6O22)(OH,F,Cl)2
Group Members:
Ferro-ferri-fluoro-hornblende ☐{Ca2}{Fe42+Fe3+}(AlSi7O22)F2
Ferro-ferri-hornblende ☐{Ca2}{Fe42+Fe3+}(AlSi7O22)(OH)2
Ferro-fluoro-hornblende ☐{Ca2}{Fe42+Al}(AlSi7O22)F2
Ferro-hornblende ☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
Magnesio-ferri-fluoro-hornblende ☐{Ca2}{Mg4Fe3+}(AlSi7O22)F2
Magnesio-ferri-hornblende ☐{Ca2}{Mg4Fe3+}(AlSi7O22)(OH)2
Magnesio-fluoro-hornblende (Na,K)1-xCa2Mg5(Si7Al)O22F2
Magnesio-hornblende ☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Chemically related to group(s):
Tschermakite Root Name☐(Ca2)(Z32+Z23+}(Al2Si6O22)(OH,F,Cl)2

Other Information

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 Hornblende Root Name

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

Internet Links for Hornblende Root Name

Localities for Hornblende Root Name

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