Sadanagaite Root Name Group
A group of related mineral species
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About Sadanagaite Root Name Group
Formula:
ACa2(C2+3C3+2)(Si5Al3O22)W2
The sadanagaite root name minerals are defined as minerals in the calcium amphibole subgroup with 0.5 < A(Na+K+ 2Ca) where Na or K is dominant, and with 1.5 < C(Al+Fe3++2Ti), where Al or Fe3+ are dominant. The W position may contain (OH), F or Cl.
The individual minerals are defined by their dominant element in the A, C2+, C3+and W position.
The individual minerals are defined by their dominant element in the A, C2+, C3+and W position.
Crystal System:
Monoclinic
Name:
Named for Ryoichi Sadanaga (b. 1920), Professor Emeritus of the University of Tokyo.
The first sadanagaite mineral was published (IMA1980-027) by Shimazaki et al. (1984). Since then, the group has been redefined twice, both on the 1997 and 2012 amphibole report. It is therefore necessary to verify all references for sadanagaite-group minerals by checking the chemical composition for correct naming of the referenced mineral.
The naming history for each species is discussed under the individual minerals.
The naming history for each species is discussed under the individual minerals.
Unique Identifiers
Mindat ID:
8787
Long-form identifier:
mindat:1:1:8787:8
Chemistry of Sadanagaite Root Name Group
Mindat Formula:
ACa2(C2+3C3+2)(Si5Al3O22)W2
The sadanagaite root name minerals are defined as minerals in the calcium amphibole subgroup with 0.5 < A(Na+K+ 2Ca) where Na or K is dominant, and with 1.5 < C(Al+Fe3++2Ti), where Al or Fe3+ are dominant. The W position may contain (OH), F or Cl.
The individual minerals are defined by their dominant element in the A, C2+, C3+and W position.
The sadanagaite root name minerals are defined as minerals in the calcium amphibole subgroup with 0.5 < A(Na+K+ 2Ca) where Na or K is dominant, and with 1.5 < C(Al+Fe3++2Ti), where Al or Fe3+ are dominant. The W position may contain (OH), F or Cl.
The individual minerals are defined by their dominant element in the A, C2+, C3+and W position.
Chemical Analysis
Oxide wt%:
| 1 | 2 | 3 | 4 | 5 | 6 | |
|---|---|---|---|---|---|---|
| SiO2 | 40.38 % | 38.51 % | 41.35 % | 37.42 % | 40.09 % | 33.82 % |
| TiO2 | .52 % | 1.53 % | 0.11 % | 0.09 % | 0.22 % | |
| Al2O3 | 18.15 % | 12.87 % | 15.93 % | 21.17 % | 19.56 % | 18.35 % |
| Cr2O3 | .00 % | 0.02 % | .00 % | 0.01 % | ||
| Fe2O3 | 5.46 % | 16.99 % | ||||
| FeO | 6.51 % | 27.42 % | .00 % | 17.03 % | 17.24 % | 22.01 % |
| MnO | .13 % | 0.73 % | .03 % | 0.1 % | ||
| MgO | 11.93 % | 2.73 % | 10.07 % | 7.14 % | 6.40 % | 4.01 % |
| CaO | 11.13 % | 7.75 % | 12.00 % | 11.26 % | 11.16 % | 11.24 % |
| Na2O | 3.27 % | 3.75 % | 2.03 % | 3.59 % | 2.65 % | 1.83 % |
| K2O | .48 % | 2.61 % | .91 % | 0.34 % | 2.17 % | |
| H2O | 2.07 % | 2.09 % | ||||
| NiO | 0.02 % | |||||
| Cl | 3.94 % | |||||
| Total: | 100.03 % | 97.92 % | 101.51 % | 98.17 % | 97.1 % | 97.59 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 5 | Na0.55 (Na0.22Ca1.78)Σ2.00 ( Mg1.42Fe2+1.90Fe3+0.26Al1.42)Σ5.00(Al2.02Si5.98)Σ8.00O22OH2 |
Sample references:
Crystallography of Sadanagaite 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) |
|---|---|---|---|---|---|---|---|
| 0007035 | Sadanagaite | Banno Y, Miyawaki R, Matsubara S, Makino K, Bunno M, Yamada S, Kamiya T (2004) Magnesiosadanagaite, a new member of the amphibole group from Kasuga-mura, Gifu Prefecture, central Japan European Journal of Mineralogy 16 177-183 | 2004 | Kasuga-mura, Gifu Prefecture, central Japan | 0 | 293 | |
| 0007034 | Sadanagaite | Banno Y, Miyawaki R, Matsubara S, Makino K, Bunno M, Yamada S, Kamiya T (2004) Magnesiosadanagaite, a new member of the amphibole group from Kasuga-mura, Gifu Prefecture, central Japan European Journal of Mineralogy 16 177-183 | 2004 | Kasuga-mura, Gifu Prefecture, central Japan | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Sadanagaite Root Name Group to other Species
Other Members of Calcium Amphibole Subgroup:
| Actinolite Root Name Group | ◻Ca2(Mg0-4.5C2+0.5-5)Si8O22(OH,F,Cl)2 | |
| Cannilloite Root Name Group | CaCa2(C2+4C3+)(Si5Al3O22)W2 | |
| Edenite Root Name Group | ACa2C5(AlSi7O22)W2 | Mon. |
| Hastingsite Root Name Group | ACa2(C2+4Fe3+)(Al2Si6O22)W2 | |
| Hornblende Root Name Group | ◻Ca2(C2+4C3+)(AlSi7O22)W2 | Mon. |
| Joesmithite | Pb2+Ca2(Mg3Fe3+2)(Si6Be2)O22(OH)2 | Mon. 2/m : P2/b |
| Pargasite Root Name Group | ACa2(C2+4C3+)(Al2Si6O22)W2 | |
| Tremolite Root Name Group | ◻Ca2(Mg4.5-5C2+0-0.5)Si8O22W2 | |
| Tschermakite Root Name Group | ◻Ca2(C2+3C3+2)(Al2Si6O22)W2 |
Sadanagaite Root Name Group Members:
| 'Ferri-sadanagaite' | NaCa2(Mg3Fe3+2)(Al3Si5O22)(OH)2 | |
| 'Ferro-chloro-sadanagaite' | KCa2(Mg3Al2)(Al3Si5O22)Cl2 | |
| 'Ferro-ferri-sadanagaite' | NaCa2(Fe2+3Fe3+2)(Al3Si5O22)(OH)2 | Mon. |
| 'Ferro-sadanagaite' | NaCa2(Fe3Al2)(Al3Si5O22)(OH)2 | |
| 'Potassic-chloro-sadanagaite' | KCa2(Mg3Al2)(Al3Si5O22)Cl2 | |
| 'Potassic-ferri-sadanagaite' | KCa2(Mg3Fe3+2)(Al3Si5O22)(OH)2 | |
| 'Potassic-ferro-chloro-sadanagaite' | KCa2(Fe2+3Al2)(Al3Si5O22)Cl2 | |
| Potassic-ferro-ferri-sadanagaite | KCa2(Fe2+3Fe3+2)(Al3Si5O22)(OH)2 | Mon. 2/m : B2/m |
| Potassic-ferro-sadanagaite | KCa2(Fe2+3Al2)(Al3Si5O22)(OH)2 | Mon. |
| Potassic-sadanagaite | KCa2(Mg3Al2)(Al3Si5O22)(OH)2 | Mon. 2 |
| Sadanagaite | NaCa2(Mg3Al2)(Si5Al3O22)(OH)2 | Mon. |
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 Sadanagaite Root Name Group
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https://www.mindat.org/min-8787.html
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References for Sadanagaite Root Name Group
Localities for Sadanagaite Root Name Group
Showing 49 localities.
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Mount Somma, Metropolitan City of Naples, Campania, Italy