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Leakeite

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Bernard Elgey Leake
Formula:
NaNa2(Mg2Al2Li)(Si8O22)(OH)2
The Leakeite group minerals are sodium amphiboles defined with:
A(Na+K+2Ca)> 0.5 apfu,
C(Al+Fe3++2Ti) > 1.5 apfu and
CLi > 0,5 apfu

Leakeite is defined with
A position: Na dominant
C2+ position: Mg dominant
C3+ position: Al dominant
W position: (OH) dominant
Name:
Leakeite was first published as a new mineral by Hawthorne et.al (1992). The Leakeite group minerals was redefined in the 2012 amphibole nomenclature. The mineral described by Hawthorne et.al (1992) is now named ferri-leakeite.

The series root name was named in 1992 by Frank Christopher Hawthorne, Roberta Oberti, Luciano Ungaretti, and Joel Dennison Grice in honor of Scottish geologist Bernard Elgey Leake [1932-], University of Glasgow and who was chairman of the IMA subcommitte to revise amphibole nomenclature. The chemical prefix designates the chemical relationship in the series.
This page provides mineralogical data about Leakeite.


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Classification of LeakeiteHide

Notes:
Intermediate member of a solid-solution series

Chemical Properties of LeakeiteHide

Formula:
NaNa2(Mg2Al2Li)(Si8O22)(OH)2

The Leakeite group minerals are sodium amphiboles defined with:
A(Na+K+2Ca)> 0.5 apfu,
C(Al+Fe3++2Ti) > 1.5 apfu and
CLi > 0,5 apfu

Leakeite is defined with
A position: Na dominant
C2+ position: Mg dominant
C3+ position: Al dominant
W position: (OH) dominant

Relationship of Leakeite to other SpeciesHide

Other Members of this group:
Ferri-fluoro-leakeite{Na}{Na2}{Mg2Fe3+2Li}(Si8O22)F2Mon. 2/m : B2/m
Ferri-leakeite[Na][Na2][Mg2Fe3+2Li]Si8O22(OH)2Mon.
Ferro-ferri-fluoro-leakeiteNa(Na2)(Fe2+2Fe3+2Li)(Si8O22)(F)2Mon.
Ferro-ferri-leakeite[Na][Na2][Fe2+2Fe3+2Li]Si8O22(OH)2Mon.
Ferro-fluoro-leakeiteNaNa2(Fe2+2Al2Li)(Si8O22)F2
Ferro-leakeiteNaNa2(Fe2+2Al2Li)(Si8O22)(OH)2
Fluoro-leakeiteNaNa2(Mg2Al2Li)(Si8O22)F2Mon. 2/m : B2/m
Oxo-mangani-leakeiteNaNa2(Mn3+4Li)Si8O22O2Mon. 2/m : B2/m
Potassic-ferri-leakeite[K][Na2][Mg2Fe3+2Li]Si8O22(OH)2Mon. 2/m : B2/m
Potassic-leakeiteKNa2(Mg2Al2Li)(Si8O22)(OH)2
Potassic-mangani-leakeite[(Na,K)][Na2][Mg2Mn3+2Li]Si8O22(OH)2Mon.

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 LeakeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hawthorne, F.C., Oberti, R., Ungaretti, L., Grice, J.D. (1992) Leakeite, NaNa2(Mg2Fe 3+ 2Li)Si8O22(OH)2, a new alkali amphibole from the Kajlidongri manganese mine, Jhabua district, Madhya Pradesh, India. American Mineralogist: 77: 1112-1115.
Mandarino, J.A. (1998) The Second List of Additions and Corrections to the Glossary of Mineral Species (1995). The Amphibole Group. Mineralogical Record: 29: 169-174.
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 LeakeiteHide

Localities for LeakeiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • New South Wales
    • Forbes Co.
      • Grenfell
Oberti, R., Boiocchi, M., Hawthorne, F. C., Ball, N. A., & Ashley, P. M. (2016). PREPUBLICATION: Oxo-mangani-leakeite from the Hoskins mine, New South Wales, Australia: occurrence and mineral description. Mineralogical Magazine.
Slovakia
 
  • Banská Bystrica Region
    • Lučenec Co.
Huraiová, M., Konečný, P., Holický, I., Nemec, O., Milovská, S., Hurai, V. (2017): Late-magmatic neptunite in composite peralkaline granite syenite nodules within a Pleistocene basalt (Bulhary, Slovakia). Periodico di Mineralogia, 86, 1-17
Mineral and/or Locality  
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