Lithium Amphibole Subgroup
A material that is NOT an approved mineral species
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About Lithium Amphibole Subgroup
Formula:
An(Li2)(Z2+3+n-2mZ3+2-n+mLim)(Si8O22)(OH,F,Cl)2
The lithium amphibole subgroup is one of the subgroups belonging to the W(OH,F,Cl) amphibole group. It is defined with Li as the dominant element in the X position ( = IMA B position).
The IMA-CNMNC definition is B(Na + Li)/ΣB ≥ 0.75, BLi/ΣB ≥ BNa/ΣB.
The Lithium amphibole subgroup are further divided into root-name groups that may have orthorhombic (holmquistite group) or monoclinic (clino-holmquistite, pedrizite and rootname 5 groups) symmetry. The root name groups are are defined by their symmetry and charge balance and dominant elements in the A and Z positions (= IMA C positions) in the generic formula above. The various positions in the formula can have the following content:
A position: x = 0 or 1, when 1, it contains Na or K as the dominant elements.
Z position: y = 0 or 1 (pedrizite group). Mg and Fe2+ are the dominant Z2+ elements and Al and Fe3+ are the dominant Z3+.
W position: (OH) or F.
In 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 IMA-CNMNC definition is B(Na + Li)/ΣB ≥ 0.75, BLi/ΣB ≥ BNa/ΣB.
The Lithium amphibole subgroup are further divided into root-name groups that may have orthorhombic (holmquistite group) or monoclinic (clino-holmquistite, pedrizite and rootname 5 groups) symmetry. The root name groups are are defined by their symmetry and charge balance and dominant elements in the A and Z positions (= IMA C positions) in the generic formula above. The various positions in the formula can have the following content:
A position: x = 0 or 1, when 1, it contains Na or K as the dominant elements.
Z position: y = 0 or 1 (pedrizite group). Mg and Fe2+ are the dominant Z2+ elements and Al and Fe3+ are the dominant Z3+.
W position: (OH) or F.
In 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.
Name:
The Lithium amphibole sub-group was separated from the Mg–Fe–Mn–Li Amphiboles in the 2012 amphibole nomenclature report.
This page provides mineralogical data about Lithium Amphibole Subgroup.
Unique Identifiers
Mindat ID:
9390
Long-form identifier:
mindat:1:1:9390:9
GUID
(UUID V4):
(UUID V4):
ffcf4539-e1cf-4dcc-86cf-dd161579e07a
IMA Classification of Lithium Amphibole Subgroup
IMA status notes:
IMA Approved Group Name
First published:
2012
Chemistry of Lithium Amphibole Subgroup
Mindat Formula:
An(Li2)(Z2+3+n-2mZ3+2-n+mLim)(Si8O22)(OH,F,Cl)2
The lithium amphibole subgroup is one of the subgroups belonging to the W(OH,F,Cl) amphibole group. It is defined with Li as the dominant element in the X position ( = IMA B position).
The IMA-CNMNC definition is B(Na + Li)/ΣB ≥ 0.75, BLi/ΣB ≥ BNa/ΣB.
The Lithium amphibole subgroup are further divided into root-name groups that may have orthorhombic (holmquistite group) or monoclinic (clino-holmquistite, pedrizite and rootname 5 groups) symmetry. The root name groups are are defined by their symmetry and charge balance and dominant elements in the A and Z positions (= IMA C positions) in the generic formula above. The various positions in the formula can have the following content:
A position: x = 0 or 1, when 1, it contains Na or K as the dominant elements.
Z position: y = 0 or 1 (pedrizite group). Mg and Fe2+ are the dominant Z2+ elements and Al and Fe3+ are the dominant Z3+.
W position: (OH) or F.
In 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 lithium amphibole subgroup is one of the subgroups belonging to the W(OH,F,Cl) amphibole group. It is defined with Li as the dominant element in the X position ( = IMA B position).
The IMA-CNMNC definition is B(Na + Li)/ΣB ≥ 0.75, BLi/ΣB ≥ BNa/ΣB.
The Lithium amphibole subgroup are further divided into root-name groups that may have orthorhombic (holmquistite group) or monoclinic (clino-holmquistite, pedrizite and rootname 5 groups) symmetry. The root name groups are are defined by their symmetry and charge balance and dominant elements in the A and Z positions (= IMA C positions) in the generic formula above. The various positions in the formula can have the following content:
A position: x = 0 or 1, when 1, it contains Na or K as the dominant elements.
Z position: y = 0 or 1 (pedrizite group). Mg and Fe2+ are the dominant Z2+ elements and Al and Fe3+ are the dominant Z3+.
W position: (OH) or F.
In 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.
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) |
|---|---|---|---|---|---|---|---|
| 0003813 | Holmquistite | Camara F, Oberti R (2005) The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in B-Li amphiboles American Mineralogist 90 1167-1176 |  | 2005 | 0 | 293 | |
| 0003814 | Holmquistite | Camara F, Oberti R (2005) The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in B-Li amphiboles American Mineralogist 90 1167-1176 | | 2005 | 0 | 293 | |
| 0003815 | Holmquistite | Camara F, Oberti R (2005) The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in B-Li amphiboles American Mineralogist 90 1167-1176 | | 2005 | 0 | 293 | |
| 0003816 | Holmquistite | Camara F, Oberti R (2005) The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in B-Li amphiboles American Mineralogist 90 1167-1176 | | 2005 | 0 | 293 | |
| 0003817 | Holmquistite | Camara F, Oberti R (2005) The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in B-Li amphiboles American Mineralogist 90 1167-1176 | | 2005 | 0 | 293 | |
| 0003818 | Holmquistite | Camara F, Oberti R (2005) The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in B-Li amphiboles American Mineralogist 90 1167-1176 | | 2005 | 0 | 293 | |
| 0020050 | Clino-ferri-holmquistite | Oberti R, Camara F, Caballero J M (2004) Ferri-ottoliniite and ferriwhittakerite, two new end-members of the new Group 5 for monoclinic amphiboles American Mineralogist 89 888-893 | | 2004 | Pedriza massif, Sierra de Guadarrama, Spain | 0 | 293 |
| 0003812 | Ferro-holmquistite | Camara F, Oberti R (2005) The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in B-Li amphiboles American Mineralogist 90 1167-1176 | | 2005 | 0 | 293 | |
| 0005890 | Ferro-ferri-pedrizite | Oberti R, Camara F, Caballero J M, Ottolini L (2003) Sodic-ferri-ferropedrizite and ferri-clinoferroholmquistite: mineral data and degree of order of the A-site cations in Li-rich amphiboles Sequence number in the CNR-IGG database: SEQ 1039 The Canadian Mineralogist 41 1345-1354 | | 2003 | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Lithium Amphibole Subgroup to other Species
Other Members of this group:
| Calcium Amphibole Subgroup | AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2 | |
| Lithium-(Magnesium-Iron-Manganese) Amphibole Subgroup | {A}{Li(Mg,Fe,Mn)}{Z5}{T8O22}(OH,F,Cl)2 | |
| Lithium-Calcium Amphibole Subgroup | {A}{LiCa}{Z5}{T8O22}(OH,F,Cl)2 | |
| Magnesium-iron-manganese Amphibole Subgroup | An(X2)(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m)O22(OH)2 | |
| Sodium Amphibole Subgroup | An(Na2)(Z5)(Si8-mAlmO22)(OH,F,Cl)2 | |
| Sodium-(Magnesium-Iron-Manganese) Amphibole Subgroup | {A}{Na(Mg,Fe,Mn)}{Z5}{T8O22}(OH,F,Cl)2 | |
| Sodium-Calcium Amphibole Subgroup | An(NaCa)(Z2+5-mZ3+m)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2 |
Group Members:
| Clino-holmquistite Root Name Group | ◻{Li2}{Z2+3Z3+2}(Si8O22)(OH,F,Cl)2 | Mon. |
| Clino-ferri-holmquistite | ◻{Li2}{Mg3Fe3+2}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| Clino-ferro-ferri-holmquistite | ◻{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| Holmquistite Root Name Group | ◻{Li2}{Z2+3Z3+2}(Si8O22)(OH)2 | Orth. |
| Ferro-ferri-holmquistite | ◻{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2 | Orth. mmm (2/m 2/m 2/m) : Pmma |
| Ferro-holmquistite | ◻{Li2}{Fe2+3Al2}(Si8O22)(OH)2 | Orth. mmm (2/m 2/m 2/m) : Pnma |
| Holmquistite | ◻{Li2}{Mg3Al2}(Si8O22)(OH)2 | Orth. mmm (2/m 2/m 2/m) : Pnma |
| Pedrizite Root Name Group | ALi2(LiZ2+2Z3+2)(Si8O22)(OH,F,Cl)2 | |
| Ferri-pedrizite | [Na][Li2][Mg2Fe3+2Li]Si8O22(OH)2 | Mon. |
| Ferro-ferri-pedrizite | [Na][Li2][Fe2+2Fe3+2Li]Si8O22(OH)2 | Mon. 2/m : B2/m |
| Ferro-fluoro-pedrizite | Na(Li2)(Fe2+2Al2Li)[Si8O22]F2 | Mon. 2/m : B2/m |
| Ferro-pedrizite | NaLi2(Fe2+2Al2Li)Si8O22(OH)2 | Mon. 2/m : B2/m |
| Fluoro-pedrizite | NaLi2(Mg2Al2Li)(Si8O22)F2 | Mon. 2/m : B2/m |
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 Lithium Amphibole Subgroup
mindat.org URL:
https://www.mindat.org/min-9390.html
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References for Lithium Amphibole Subgroup
Reference List:
Oberti, Roberta, Cá mara, Fernando, Ottolini, Luisa, Caballero, José Maria (2003) Lithium in amphiboles: detection, quantification, and incorporation mechanisms in the compositional space bridging sodic and BLi-amphiboles. European Journal of Mineralogy, 15 (2) 309-319 doi:10.1127/0935-1221/2003/0015-0309
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