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Hornblende Root Name Group
A group of related mineral species
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The hornblende root name is in a mineralogical sense as amphiboles in the calcium amphibole subgroup withA(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 their 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 or dark coloured undefined amphibole in the calcium (and sometimes in the sodium-calcium) subgroups.
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 or dark coloured undefined amphibole in the calcium (and sometimes in the sodium-calcium) subgroups.
Unique Identifiers
| Actinolite Root Name Group | ◻Ca2(Mg0-4.5M2+0.5-5)Si8O22(OH,F,Cl)2 | |
| Cannilloite Root Name Group | CaCa2(Z2+4Z3+)(Si5Al3O22)(OH,F,Cl)2 | |
| Edenite Root Name Group | ACa2Z5(AlSi7O22)((OH),F,Cl)2 | Mon. |
| Hastingsite Root Name Group | ACa2(Z2+4Fe3+)(Al2Si6O22)(OH,F,Cl)2 | |
| Joesmithite | Pb2+Ca2(Mg3Fe3+2)(Si6Be2)O22(OH)2 | Mon. 2/m :P2/b |
| Pargasite Root Name Group | (A)(Ca2){Z2+4Z3+)(Al2Si6O22)(OH,F,Cl)2 | |
| Sadanagaite Root Name Group | A (Ca2)(Z2+3Z3+2)(Si5Al3O22)(OH,F,Cl)2 | Mon. |
| Tremolite Root Name Group | ◻Ca2(Mg4.5-5M2+0-0.5)Si8O22W2 | |
| Tschermakite Root Name Group | ◻(Ca2)(Z2+3Z3+2}(Al2Si6O22)(OH,F,Cl)2 |
Hornblende Root Name Group Members:
| Ferro-ferri-hornblende | ◻Ca2(Fe2+4Fe3+)(AlSi7O22)(OH)2 | Mon. 2/m :B2/m |
| Ferro-hornblende | ◻Ca2(Fe2+4Al)(Si7Al)O22(OH)2 | Mon. 2/m :B2/m |
| Magnesio-ferri-fluoro-hornblende | ◻Ca2(Mg4Fe3+)(AlSi7O22)F2 | Mon. 2/m :B2/m |
| Magnesio-ferri-hornblende | ◻Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2 | Mon. 2/m :B2/m |
| Magnesio-fluoro-hornblende | ◻Ca2(Mg4Al)(AlSi7O22)F2 | |
| Magnesio-hornblende | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 | Mon. 2/m :B2/m |
Chemically related to group(s):
| Tschermakite Root Name Group | ◻(Ca2)(Z2+3Z3+2}(Al2Si6O22)(OH,F,Cl)2 |