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Lithium-(Magnesium-Iron-Manganese) Amphibole Subgroup

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Formula:
{A}{Li(Mg,Fe,Mn)}{Z5}{T8O22}(OH,F,Cl)2
The lithium-(magnesium-iron-manganese) amphibole subgroup is one of the subgroups belonging to the W(OH,F,Cl) amphibole group. It is defined with Li and either Mg,Fe2+ or Mn2+ as the dominant elements in the X position (=IMA B position).

The IMA-CNMNC definition is 0.75 >B(Ca + ΣM2+)/ΣB > 0.25, BΣM2+/ΣB > BΣCa/ΣB and
0.75 > B(Na + Li)/ΣB > 0.25, BLi/ΣB > BNa/ΣB.)

BΣM refers to BΣ(Mg,Mn,Fe)

The lithium-(magnesium-iron-manganese) amphibole subgroup is further divided into root-name groups based on Mg, Fe or Mn dominance in the X position (= IMA B position) and the valence distribution in the A, Z (= IMA C position) and T positions.
Name:
The lithium-(magnesium-iron-manganese) amphibole subgroup was defined in the 2012 amphibole nomenclature.
This page provides mineralogical data about Lithium-(Magnesium-Iron-Manganese) Amphibole Subgroup.


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Classification of Lithium-(Magnesium-Iron-Manganese) Amphibole SubgroupHide

Notes:
Intermediate member of a solid-solution series

Chemical Properties of Lithium-(Magnesium-Iron-Manganese) Amphibole SubgroupHide

Formula:
{A}{Li(Mg,Fe,Mn)}{Z5}{T8O22}(OH,F,Cl)2

The lithium-(magnesium-iron-manganese) amphibole subgroup is one of the subgroups belonging to the W(OH,F,Cl) amphibole group. It is defined with Li and either Mg,Fe2+ or Mn2+ as the dominant elements in the X position (=IMA B position).

The IMA-CNMNC definition is 0.75 >B(Ca + ΣM2+)/ΣB > 0.25, BΣM2+/ΣB > BΣCa/ΣB and
0.75 > B(Na + Li)/ΣB > 0.25, BLi/ΣB > BNa/ΣB.)

BΣM refers to BΣ(Mg,Mn,Fe)

The lithium-(magnesium-iron-manganese) amphibole subgroup is further divided into root-name groups based on Mg, Fe or Mn dominance in the X position (= IMA B position) and the valence distribution in the A, Z (= IMA C position) and T positions.

Relationship of Lithium-(Magnesium-Iron-Manganese) Amphibole Subgroup to other SpeciesHide

Other Members of this group:
Calcium Amphibole SubgroupAn(Ca2)(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
Fluor-hornblende(◻/Na,K)Ca2({Fe2+/Mg}4{Fe3+/Mg}}(AlSi7O22)F2
Lithium Amphibole SubgroupAn(Li2)(Z2+3+n-2mZ3+2-n+mLim)(Si8O22)(OH,F,Cl)2
Lithium-Calcium Amphibole Subgroup{A}{LiCa}{Z5}{T8O22}(OH,F,Cl)2
Magnesium-iron-manganese Amphibole SubgroupAn(X2)(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m)O22(OH)2
Sodium Amphibole SubgroupAn(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 SubgroupAn(NaCa)(Z2+5-mZ3+m)(Si8-(n+m+1)Al(n+m-1)O22)(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 Lithium-(Magnesium-Iron-Manganese) Amphibole SubgroupHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 Lithium-(Magnesium-Iron-Manganese) Amphibole SubgroupHide

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