Log In
Barroisite Root Name Group
A group of related mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Barroisite Root Name Group
Formula:
âŧ(CaNa)(C2+3C3+2)(AlSi7O22)W2
The barroisite minerals are sodium-calcium amphiboles defined with A(Na+K+2Ca)< 0.5 apfu and 1.5 apfu < C(Al+Fe3++2Ti).
The individual minerals are identified on their dominant elements in the C2+,C3+ and the W dominant ion. The dominant elements in these positions are normally:
C2+ position: Mg or Fe dominant
C3+ position: Al or Fe dominant
W position: (OH) or F dominant
The individual minerals are identified on their dominant elements in the C2+,C3+ and the W dominant ion. The dominant elements in these positions are normally:
C2+ position: Mg or Fe dominant
C3+ position: Al or Fe dominant
W position: (OH) or F dominant
Member of:
Name:
The amphibole barroisite was named in 1922 by Murgoci after the French geologist Charles BARROIS (Lille, France, 21st April 1851 - Sainte-GeneviÃĻve-en-Caux, France, 5th November 1939). Barroisite was set as an amphibole rootname by Hawthorne et al. (2012)
This page provides mineralogical data about Barroisite Root Name Group.
Unique Identifiers
Mindat ID:
43476
Long-form identifier:
mindat:1:1:43476:2
Chemistry of Barroisite Root Name Group
Mindat Formula:
âŧ(CaNa)(C2+3C3+2)(AlSi7O22)W2
The barroisite minerals are sodium-calcium amphiboles defined with A(Na+K+2Ca)< 0.5 apfu and 1.5 apfu < C(Al+Fe3++2Ti).
The individual minerals are identified on their dominant elements in the C2+,C3+ and the W dominant ion. The dominant elements in these positions are normally:
C2+ position: Mg or Fe dominant
C3+ position: Al or Fe dominant
W position: (OH) or F dominant
The barroisite minerals are sodium-calcium amphiboles defined with A(Na+K+2Ca)< 0.5 apfu and 1.5 apfu < C(Al+Fe3++2Ti).
The individual minerals are identified on their dominant elements in the C2+,C3+ and the W dominant ion. The dominant elements in these positions are normally:
C2+ position: Mg or Fe dominant
C3+ position: Al or Fe dominant
W position: (OH) or F dominant
Chemical Analysis
Oxide wt%:
| 1 | 2 | 3 | |
|---|---|---|---|
| SiO2 | 48.02 % | 53.2 % | 43.93 % |
| TiO2 | 0.38 % | 0.10 % | |
| Al2O3 | 12.92 % | 11.61 % | 15.28 % |
| Cr2O3 | 0.01 % | ||
| FeO | 9.34 % | 10.98 % | |
| MnO | 0.19 % | 0.05 % | |
| NiO | |||
| MgO | 13.32 % | 11.81 % | 7.51 % |
| CaO | 8.01 % | 3.13 % | 8.54 % |
| Na2O | 4.23 % | 6.43 % | 3.63 % |
| K2O | 0.45 % | 0.23 % | |
| F | 0.16 % | ||
| Cl | 0.68 % | ||
| FeOt | 17.78 % | ||
| Total: | 97.71 % | 97.54 % | 96.67 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 3 | Na0.39 (Na0.65Ca1.35)ÎĢ2.00 ( Mg1.65Fe2+1.59Fe3+0.61Al1.15)ÎĢ5.00(Al1.51Si6.49)ÎĢ8.00O22OH2 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Betic ophiolite, CÃģbdar, AlmerÃa, Andalusia, Spain | Puga, E.; Ruiz Cruz, M. D.; De Federico, A. D. (2002) Polymetamorphic amphibole veins in metabasalts from the Betic Ophiolitic Association at Cobdar, southeastern Spain: Relics of ocean-floor metamorphism preserved through the Alpine orogeny. The Canadian Mineralogist, 40 (1). p.67-83. doi:10.2113/gscanmin.40.1.67 | Sample from a meta-basalt |
| 2 | Roadcut Rv 5, Kvineset, FÃļrde, Sunnfjord, Vestland, Norway | The analysed amphibole occurs as minute inclusions in the core of eclogite garnets. Krogh (1980) considers the amphiboles to represent a pre-eclogitic amphibolite phase. The sample is analysed with EPMA. Normalized to 13 cations | |
| 3 | Kovalo eclogites, Kechros, Arriana, Rhodope, Eastern Macedonia and Thrace, Greece | EMPA analysis of an amphibole grain from an eclogite. |
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0019554 | Barroisite | Heritsch H, Paulitsch P, Walitzi E M (1957) Die Struktur von Karinthin und einer barroisitischen Hornblende Tschermaks Mineralogische und Petrographische Mitteilungen 6 215-22 | 1957 | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Barroisite Root Name Group to other Species
Member of:
Other Members of Sodium-Calcium Amphibole Subgroup:
| Katophorite Root Name Group | A(CaNa)(C2+4C3+)(AlSi7O22)W2 | |
| Richterite Root Name Group | A(CaNa)C5(Si8O22)W2 | Mon. |
| Taramite Root Name Group | A(CaNa)(C2+3C3+2)(Al2Si6O22)W2 | |
| Winchite Root Name Group | âŧ(CaNa)(C2+4C3+)(Si8O22)W2 | Mon. |
Barroisite Root Name Group Members:
| Barroisite | âŧ(CaNa)(Mg3Al2)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 'Ferri-barroisite' | âŧ(CaNa)(Mg3Fe3+2)(AlSi7O22)(OH)2 | |
| 'Ferro-barroisite' | âŧ(CaNa)(Fe2+3Al2)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 'Ferro-ferri-barroisite' | âŧ(CaNa)(Fe2+3Fe3+2)(AlSi7O22)(OH)2 |
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 Barroisite Root Name Group
mindat.org URL:
https://www.mindat.org/min-43476.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
References for Barroisite Root Name Group
Reference List:
Little Deer Creek Eclogite, Skagit County, Washington, USA