Edenite Root Name Group
A group of related mineral species
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About Edenite Root Name Group
Formula:
ACa2C5(AlSi7O22)W2
A = Na or K
C = Mg or Fe2+
W = (OH), F or Cl
C = Mg or Fe2+
W = (OH), F or Cl
Crystal System:
Monoclinic
The edenite minerals is defined as monoclinic amphiboles in the calcium amphibole subgroup with occupancy in the A position equal to or larger than 0.5 apfu (ANa+K+2Ca)≥0.5 apfu) and C(Al+Fe3++2Ti)≤0.5 apfu. The edenite minerals are defined by the dominant element in the A position, the C position and the W position.
The edenite root name minerals are chemically closely related to tremolite/actinolite, richterite root name, katophorite root name and pargasite root name amphiboles. To accurately distinguish between these closely related amphiboles the combination of EMPA and Mössbauer spectroscopy or equivalent is required.
The edenite endmember itself is unstable, and near endmember compositions are not found in nature. Furthermore, all attempts to synthesize an endmember edenite has failed. (Oberti et al. 2006). It has been found that Fe and F stabilizes the edenite molecule and therefore edenite found in nature always contain significant amounts of Fe and/or F, although not always enough to qualify as ferro-edenite or fluoro-edenite. The content of F is not always analysed, and (OH) dominance is generally assumed when analyzing amphiboles. For the edenite root name group minerals, this assumption is probably incorrect in many cases.
The edenite root name minerals are chemically closely related to tremolite/actinolite, richterite root name, katophorite root name and pargasite root name amphiboles. To accurately distinguish between these closely related amphiboles the combination of EMPA and Mössbauer spectroscopy or equivalent is required.
The edenite endmember itself is unstable, and near endmember compositions are not found in nature. Furthermore, all attempts to synthesize an endmember edenite has failed. (Oberti et al. 2006). It has been found that Fe and F stabilizes the edenite molecule and therefore edenite found in nature always contain significant amounts of Fe and/or F, although not always enough to qualify as ferro-edenite or fluoro-edenite. The content of F is not always analysed, and (OH) dominance is generally assumed when analyzing amphiboles. For the edenite root name group minerals, this assumption is probably incorrect in many cases.
Unique Identifiers
Mindat ID:
8966
Long-form identifier:
mindat:1:1:8966:7
IMA Classification of Edenite Root Name Group
IMA status notes:
IMA Approved Group Name
First published:
2012
Chemistry of Edenite Root Name Group
Mindat Formula:
ACa2C5(AlSi7O22)W2
A = Na or K
C = Mg or Fe2+
W = (OH), F or Cl
A = Na or K
C = Mg or Fe2+
W = (OH), F or Cl
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| SiO2 | 48.75 % |
| TiO2 | 0.11 % |
| Al2O3 | 7.54 % |
| Cr2O3 | 0.01 % |
| FeO | 10.79 % |
| MnO | 0.12 % |
| MgO | 13.87 % |
| CaO | 11.99 % |
| Na2O | 2.51 % |
| K2O | 0.7 % |
| NiO | 0.07 % |
| Total: | 96.46 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Shuanghe, Qianshan City, Anqing, Anhui, China | Bοlin, Cong, Mingguo, Zhai, Carswell, Dennis A. Cars, Wilson, Robert N., Qingchen, Wang, Zhοngyan, Zhao, Windley, Brian F. (1995) Petrogenesis of ultrahigh-pressure rocks and their country rocks at Shuanghe in Dabieshan, Central China. European Journal of Mineralogy, 7 (1) 119-138 doi:10.1127/ejm/7/1/0119 | One of the analyses provided by Bolin et al. (1995) on amphiboles from carbonate eclogites corresponds to an edenite composition. |
Crystallography of Edenite 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) |
|---|---|---|---|---|---|---|---|
| 0020433 | Fluoro-edenite | Della Ventura G, Bellatreccia F, Camara F, Oberti R (2014) Crystal-chemistry and short-range order of fluoro-edenite and fluoro-pargasite: a combined X-ray diffraction and FTIR spectroscopic approach Mineralogical Magazine 78 293-310 | 2014 | Franklin Quarry, Franklin, New Jersey, USA | 0 | 293 | |
| 0020432 | Fluoro-edenite | Della Ventura G, Bellatreccia F, Camara F, Oberti R (2014) Crystal-chemistry and short-range order of fluoro-edenite and fluoro-pargasite: a combined X-ray diffraction and FTIR spectroscopic approach Mineralogical Magazine 78 293-310 | 2014 | Limecrest-Southdown Quarry, Sparta, New Jersey, USA | 0 | 293 | |
| 0020431 | Fluoro-edenite | Della Ventura G, Bellatreccia F, Camara F, Oberti R (2014) Crystal-chemistry and short-range order of fluoro-edenite and fluoro-pargasite: a combined X-ray diffraction and FTIR spectroscopic approach Mineralogical Magazine 78 293-310 | 2014 | Sterling Hill, Ogdensburg, New Jersey, USA | 0 | 293 | |
| 0004978 | Fluoro-edenite | Andreozzi G B, Ballirano P, Gianfagna A, Mazziotti-Tagliani S, Pacella A (2009) Structural and spectroscopic characterization of a suite of fibrous amphiboles with high environmental and health relevance from Biancaville (Sicily, Italy) Sample Name: Sample 4 American Mineralogist 94 1333-1340 | ![]() | 2009 | Biancaville, Sicily, Italy | 0 | 293 |
| 0004977 | Fluoro-edenite | Andreozzi G B, Ballirano P, Gianfagna A, Mazziotti-Tagliani S, Pacella A (2009) Structural and spectroscopic characterization of a suite of fibrous amphiboles with high environmental and health relevance from Biancaville (Sicily, Italy) Sample Name: Sample 3 American Mineralogist 94 1333-1340 | ![]() | 2009 | Biancaville, Sicily, Italy | 0 | 293 |
| 0004976 | Fluoro-edenite | Andreozzi G B, Ballirano P, Gianfagna A, Mazziotti-Tagliani S, Pacella A (2009) Structural and spectroscopic characterization of a suite of fibrous amphiboles with high environmental and health relevance from Biancaville (Sicily, Italy) Sample Name: Sample 2 American Mineralogist 94 1333-1340 | ![]() | 2009 | Biancaville, Sicily, Italy | 0 | 293 |
| 0004975 | Fluoro-edenite | Andreozzi G B, Ballirano P, Gianfagna A, Mazziotti-Tagliani S, Pacella A (2009) Structural and spectroscopic characterization of a suite of fibrous amphiboles with high environmental and health relevance from Biancaville (Sicily, Italy) Sample Name: Sample 1 American Mineralogist 94 1333-1340 | ![]() | 2009 | Biancaville, Sicily, Italy | 0 | 293 |
| 0006136 | Fluoro-edenite | Gianfagna A, Andreozzi G B, Ballirano P, Mazziotti-Tagliani S, Bruni B M (2007) Structural and chemical contrasts between prismatic and fibrous fluoro-edenite from Biancavilla, Sicily, Italy The Canadian Mineralogist 45 249-262 | ![]() | 2007 | Biancavilla, Mt. Etna, Sicily, Italy | 0 | 293 |
| 0012347 | Fluoro-edenite | Rastsvetaeva R K, Pushcharovsky D Y, Borutskii B E (1995) Crystal structure of K,F-edenite from Khibini Crystallography Reports 40 27-30 | 1995 | Khibini alkali massif, Yum'erchorr mountain, Kola Peninsula, Russia | 0 | 293 | |
| 0002746 | Fluoro-edenite | Gianfagna A, Oberti R (2001) Fluoro-edenite from Biancavilla (Catania, Sicily, Italy): Crystal chemistry of a new amphibole end-member American Mineralogist 86 1489-1493 | ![]() | 2001 | 0 | 293 | |
| 0006770 | Fluoro-edenite | Welch M D, Knight K S (1999) A neutron powder diffraction study of cation ordering in high-temperature synthetic amphiboles European Journal of Mineralogy 11 321-331 | 1999 | 0 | 293 | ||
| 0006647 | Fluoro-edenite | Oberti R, Hawthorne F C, Raudsepp M (1997) The behaviour of Mn in amphiboles: Mn in synthetic fluor-edenite and synthetic fluor-pargasite European Journal of Mineralogy 9 115-122 | 1997 | 0 | 293 | ||
| 0005344 | Fluoro-edenite | Boschmann K F, Burns P C, Hawthorne F C, Raudsepp M, Turnock A C (1994) A-site disorder in synthetic fluor-edenite, a crystal-structure study The Canadian Mineralogist 32 21-30 | ![]() | 1994 | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Edenite Root Name Group to other Species
Member of:
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 | |
| Hastingsite Root Name Group | ACa2(Z2+4Fe3+)(Al2Si6O22)(OH,F,Cl)2 | |
| Hornblende Root Name Group | ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 | Mon. |
| Joesmithite | Pb2+Ca2(Mg3Fe3+2)(Si6Be2)O22(OH)2 | Mon. 2/m : P2/b |
| Pargasite Root Name Group | (A)(Ca2){Z2+4Z3+)(Al2Si6O22)(OH,F,Cl)2 | |
| Sadanagaite Root Name Group | A (Ca2)(Z2+3Z3+2)(Si5Al3O22)(OH,F,Cl)2 | Mon. |
| Tremolite Root Name Group | ◻Ca2(Mg4.5-5M2+0-0.5)Si8O22W2 | |
| Tschermakite Root Name Group | ◻(Ca2)(Z2+3Z3+2}(Al2Si6O22)(OH,F,Cl)2 |
Edenite Root Name Group Members:
| Edenite | NaCa2Mg5(Si7Al)O22(OH)2 | Mon. 2/m : B2/m |
| Ferro-edenite | NaCa2Fe2+5(Si7Al)O22(OH)2 | Mon. 2/m : B2/m |
| Ferro-fluoro-edenite | NaCa2Fe2+5(AlSi7O22)F2 | Mon. 2/m : B2/m |
| Fluoro-edenite | NaCa2Mg5(Si7Al)O22F2 | Mon. 2/m : P2/m |
| 'Potassic-ferro-chloro-edenite' | KCa2Fe2+5(AlSi7O22)Cl2 |
Click on any node to view relationships. Formula-derived relationship network for the group members above. 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 Edenite Root Name Group
mindat.org URL:
https://www.mindat.org/min-8966.html
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References for Edenite Root Name Group
Reference List:
Oberti, R., Camara, F., Ventura, G. D., Iezzi, G., Benimoff, A. I. (2006) Parvo-mangano-edenite, parvo-manganotremolite, and the solid solution between Ca and Mn2+ at the M4 site in amphiboles. American Mineralogist, 91 (4) 526-532 doi:10.2138/am.2006.1905
Localities for Edenite Root Name Group
Showing 375 localities.
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.





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Lemolo Lake, Douglas County, Oregon, USA