Hornblende Root Name Group
A group of related mineral species
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About Hornblende Root Name Group
Formula:
◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
Crystal System:
Monoclinic
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 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
Mindat ID:
8789
Long-form identifier:
mindat:1:1:8789:2
GUID
(UUID V4):
(UUID V4):
9247b8b4-9c62-440d-9e31-5a0ba1b2ecfe
Chemistry of Hornblende Root Name Group
Mindat Formula:
◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
Crystallography of Hornblende Root Name Group
Crystal System:
Monoclinic
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0012672 | Ferro-hornblende | Guha R, Nag D K, Iyengar S V P (1987) Structure of an amphibole from Simlipal granite, India Indian Minerals 41 32-41 | 1987 | Simlipal granite, India | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Hornblende Root Name Group to other Species
Other Members of this group:
| 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 |
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 | ◻Ca2Mg5(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 |
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.
Internet Links for Hornblende Root Name Group
mindat.org URL:
https://www.mindat.org/min-8789.html
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Search Engines:
Betts Manganese Mines, Plainfield, Hampshire County, Massachusetts, USA