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Potassic-eckermannite

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Formula:
{K}{Na2}{Mg4Al}(Si8O22)(OH)2
The eckermannite group minerals are sodium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 0.5 apfu < C(Al+Fe3++2Ti) < 1.5 apfu with Al as the dominant element

Potassic-eckermannite is defined with

A position: K dominant
C2+ position: Mg dominant
C3+ position: Al dominant
W position: (OH) dominant
This page provides mineralogical data about Potassic-eckermannite.


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Classification of Potassic-eckermanniteHide

9.D0.

9 : SILICATES (Germanates)
D : Inosilicates
0 :

Chemical Properties of Potassic-eckermanniteHide

Formula:
{K}{Na2}{Mg4Al}(Si8O22)(OH)2

The eckermannite group minerals are sodium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 0.5 apfu < C(Al+Fe3++2Ti) < 1.5 apfu with Al as the dominant element

Potassic-eckermannite is defined with

A position: K dominant
C2+ position: Mg dominant
C3+ position: Al dominant
W position: (OH) dominant

Relationship of Potassic-eckermannite to other SpeciesHide

Other Members of this group:
EckermanniteNaNa2(Mg4Al}Si8O22(OH)2Mon. 2/m : B2/m
Ferro-eckermanniteNaNa2(Fe2+4Al)Si8O22(OH)2Mon.
Ferro-fluoro-eckermanniteNaNa2(Fe2+4Al}Si8O22F2
Fluoro-eckermanniteNaNa2(Mg4Al}Si8O22F2
Mangano-ferri-eckermannite{Na}{Na2}{Mn2+4Fe3+}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 Potassic-eckermanniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Zhao, Y., Li, D. (2003) Amphiboles in Skarn Deposits of China. Mineral Deposits: 22(4): 345-359.
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 Potassic-eckermanniteHide

Localities for Potassic-eckermanniteHide

ⓘ - 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.
China
Yiming Zhao and Daxin Li (2003): Mineral Deposits 22(4), 345-359
 
Mineral and/or Locality  
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