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Hornblende Root Name

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Crystal System:
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 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.

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Chemical Properties of Hornblende Root NameHide


Crystallography of Hornblende Root NameHide

Crystal System:

Relationship of Hornblende Root Name to other SpeciesHide

Other Members of this group:
Cannilloite Root NameCa(Ca2)(Z2+4Z3+))(Al3Si5O22)(OH,F,Cl)2
Edenite Root NameA(Ca2)Z5(AlSi7O22)((OH,F,Cl)2Mon.
Hastingsite Root Name(A)(Ca2){Z2+4 Fe3+)(Al2Si6O22)(OH,F,Cl)2
Pargasite Root Name(A)(Ca2){Z2+4 Al)(Al2Si6O22)(OH,F,Cl)2
Sadanagaite Root NameA (Ca2)(Z2+3Z3+2)(Si5Al3O22)(OH,F,Cl)2Mon.
Tremolite-Actinolite Series☐{Ca2}{Z5}(Si8O22)(OH,F,Cl)2
Tschermakite Root Name☐(Ca2)(Z2+3Z3+2}(Al2Si6O22)(OH,F,Cl)2
Group Members:
Ferro-ferri-fluoro-hornblende ☐{Ca2}{Fe2+4Fe3+}(AlSi7O22)F2
Ferro-ferri-hornblende ☐Ca2(Fe2+4Fe3+)(AlSi7O22)(OH)2Mon. 2/m : B2/m
Ferro-fluoro-hornblende ☐Ca2(Fe2+4Al)(AlSi7O22)F2
Ferro-hornblende ☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2Mon.
Magnesio-ferri-fluoro-hornblende ☐{Ca2}{Mg4Fe3+}(AlSi7O22)F2Mon. 2/m : B2/m
Magnesio-ferri-hornblende ☐{Ca2}{Mg4Fe3+}(AlSi7O22)(OH)2Mon. 2/m : B2/m
Magnesio-fluoro-hornblende (Na,K)1-xCa2Mg5(Si7Al)O22F2
Magnesio-hornblende ☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2Mon.
Chemically related to group(s):
Tschermakite Root Name☐(Ca2)(Z2+3Z3+2}(Al2Si6O22)(OH,F,Cl)2

Other InformationHide

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 NameHide

Reference List:
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Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031-2048.

Internet Links for Hornblende Root NameHide

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