Eckermannite Root Name Group
A group of related mineral species
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About Eckermannite Root Name Group
Formula:
ANa2(C2+4Al}Si8O22W2
The eckermannite 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. The individual members are defined by their dominant element in the A, C2+ and W position.
Crystal System:
Monoclinic
Name:
For (Claes Walter) Harry von Eckermann (1886-1969), Swedish industrialist, mineralogist and petrologist.
This page provides mineralogical data about Eckermannite Root Name Group.
Unique Identifiers
Mindat ID:
8967
Long-form identifier:
mindat:1:1:8967:4
Chemistry of Eckermannite Root Name Group
Mindat Formula:
ANa2(C2+4Al}Si8O22W2
The eckermannite 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. The individual members are defined by their dominant element in the A, C2+ and W position.
The eckermannite 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. The individual members are defined by their dominant element in the A, C2+ and W position.
Chemical Analysis
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | A(Na0.74K0.24◻0.02)BΣ1.00(Na1.52Ca0.24Mn2+0.24)CΣ2.00(Mg2.54Mn2+1.45Mn3+0.71Fe3+0.26Ti0.04)Σ5.00T(Si7.97Al0.03)Σ8.00OW22[(OH)1.52O0.48]Σ2.00 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Matsumaezawa pit, Tanohata mine, Tanohata, Shimohei District, Iwate Prefecture, Japan | Kasatkin, Anatoly V., Zubkova, Natalia V., Agakhanov, Atali A., Chukanov, Nikita V., Škoda, Radek, Nestola, Fabrizio, Belakovskiy, Dmitry I., Pekov, Igor V. (2023) Mangani-eckermannite, NaNa2(Mg4Mn3+)Si8O22(OH)2, a new amphibole from Tanohata Mine, Iwate Prefecture, Japan. Mineralogical Magazine, 87 (6) 935-942 doi:10.1180/mgm.2023.63 | via EPMA, SIMS, and SC-XRD-based structure refinement; empirical formula basis: O+OH=24 |
Crystallography of Eckermannite 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) |
|---|---|---|---|---|---|---|---|
| 0020422 | Eckermannite | Oberti R, Boiocchi M, Hawthorne F C, Ball N A, Harlow G E (2015) Eckermannite revised: The new holotype from the Jade Mine Tract, Myanmar-crystal structure, mineral data, and hints on the reasons for the rarity of eckermannite American Mineralogist 100 909-914 | 2015 | Jade Mine Tract, Kachin Province, Myanmar | 0 | 293 | |
| 0017887 | Mangano-ferri-eckermannite | Barkley M C, Yang H, Downs R T (2010) Kozulite, a Mn-rich alkali amphibole Acta Crystallographica E66 i83-i83 |  | 2010 | Tanohata mine, Iwate Prefecture, Tohoku Region, Honshu Island, Japan | 0 | 293 |
CIF Raw Data - click here to close
Synonyms of Eckermannite Root Name Group
Sodic amphibole (in part)
Relationship of Eckermannite Root Name Group to other Species
Other Members of Sodium Amphibole Subgroup:
| Arfvedsonite Root Name Group | ANa2(C2+4Fe3+}Si8O22W2 | Mon. |
| Glaucophane Root Name Group | ◻Na2(C2+3Al2)Si8O22W2 | Mon. |
| Leakeite Root Name Group | ANa2(C2+2C3+2Li)(Si8O22)W2 | |
| Nybøite Root Name Group | ANa2(C2+3C3+2)(AlSi7O22)W2 | |
| Riebeckite Root Name Group | ◻Na2(C2+3Fe3+2)(Si8O22)W2 | Mon. |
Eckermannite Root Name Group Members:
| Eckermannite | NaNa2(Mg4Al}Si8O22(OH)2 | Mon. 2/m : B2/m |
| 'Ferro-eckermannite' | NaNa2(Fe2+4Al)Si8O22(OH)2 | Mon. |
| Mangani-eckermannite | NaNa2(Mg4Mn3+)Si8O22(OH)2 | Mon. 2/m : B2/m |
| Mangano-ferri-eckermannite | NaNa2(Mn2+4Fe3+)Si8O22(OH)2 | Mon. 2/m : B2/m |
| Scandio-fluoro-eckermannite | NaNa2(Mg4Sc)(Si8O22)F2 | Mon. 2/m : B2/m |
Click on any node to view relationships. Formula-derived relationship network for the group members above. Use Find related species to add formula-neighbour species outside the current group view. Solid links show inferred chemical differences; dashed violet links show same-formula crystallographic differences. Hydration states are not treated as relationship changes. These relationships do not imply any real-world substitution reactions between these species.
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 Eckermannite Root Name Group
mindat.org URL:
https://www.mindat.org/min-8967.html
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Woods Mine, Inglis Co., New South Wales, Australia