Glaucophane Root Name Group
A group of related mineral species
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About Glaucophane Root Name Group
Formula:
◻Na2(C2+3Al2)Si8O22W2
The glaucophane minerals are sodium amphiboles defined with A(Na+K+2Ca)< 0.5 apfu and 1.5 apfu < C(Al+Fe3++2Ti) with Al as the dominant element in the C3+ position.
The individual minerals are defined by the dominant elements in the C2+ and W positions. The most common dominant elements in the various positions are:
C2+ position: Mg or Fe2+ dominant
W position: (OH) or F dominant
The individual minerals are defined by the dominant elements in the C2+ and W positions. The most common dominant elements in the various positions are:
C2+ position: Mg or Fe2+ dominant
W position: (OH) or F dominant
Crystal System:
Monoclinic
Name:
From the Greek γλαυκός for "sky-blue" and φαίνεσθαι "to appear", in allusion to its colour.
This page provides mineralogical data about Glaucophane Root Name Group.
Unique Identifiers
Mindat ID:
8962
Long-form identifier:
mindat:1:1:8962:9
Chemistry of Glaucophane Root Name Group
Mindat Formula:
◻Na2(C2+3Al2)Si8O22W2
The glaucophane minerals are sodium amphiboles defined with A(Na+K+2Ca)< 0.5 apfu and 1.5 apfu < C(Al+Fe3++2Ti) with Al as the dominant element in the C3+ position.
The individual minerals are defined by the dominant elements in the C2+ and W positions. The most common dominant elements in the various positions are:
C2+ position: Mg or Fe2+ dominant
W position: (OH) or F dominant
The glaucophane minerals are sodium amphiboles defined with A(Na+K+2Ca)< 0.5 apfu and 1.5 apfu < C(Al+Fe3++2Ti) with Al as the dominant element in the C3+ position.
The individual minerals are defined by the dominant elements in the C2+ and W positions. The most common dominant elements in the various positions are:
C2+ position: Mg or Fe2+ dominant
W position: (OH) or F dominant
Chemical Analysis
Oxide wt%:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
|---|---|---|---|---|---|---|---|---|---|---|
| SiO2 | 56.48 % | 56.48 % | 59.24 % | 57.79 % | 57.80 % | 56.43 % | 54.74 % | 57.50 % | 56.11 % | 57.45 % |
| TiO2 | 0.08 % | 0.08 % | 0.03 % | 0.13 % | 0.06 % | 0.21 % | 0.04 % | 0.03 % | ||
| Cr2O3 | 0.07 % | 0.07 % | 0.04 % | 0.00 % | ||||||
| Al2O3 | 9.53 % | 9.53 % | 11.61 % | 12.94 % | 13.91 % | 10.35 % | 10.64 % | 9.69 % | 10.75 % | 12.29 % |
| MgO | 7.90 % | 7.9 % | 13.01 % | 12.25 % | 17.32 % | 11.70 % | 11.51 % | 10.86 % | 10.28 % | 13.78 % |
| CaO | 0.70 % | 0.7 % | 0.3 % | 0.64 % | 0.60 % | 1.49 % | 2.74 % | 1.37 % | 1.31 % | 1.77 % |
| MnO | 0.05 % | 0.05 % | 0.08 % | 0.15 % | 0.05 % | 0.05 % | 0.05 % | 0.13 % | 0.03 % | |
| FeO | 16.04 % | 16.04 % | 3.68 % | 5.88 % | 0.89 % | 10.20 % | 11.16 % | 10.77 % | 11.95 % | 4.88 % |
| Na2O | 7.02 % | 7.02 % | 7.47 % | 8.64 % | 5.89 % | 7.03 % | 6.71 % | 6.73 % | 6.79 % | 6.87 % |
| K2O | 0.02 % | 0.02 % | 0.05 % | 0.08 % | 0.07 % | 0.06 % | 0.3 % | 0.08 % | 0.06 % | |
| H2O | 2.12 % | 2.10 % | 2.22 % | 2.22 % | ||||||
| Fe2O3 | 1.2 % | |||||||||
| Total: | 100.01 % | 99.99 % | 98.89 % | 100.72 % | 96.59 % | 97.31 % | 98.06 % | 96.92 % | 97.48 % | 97.16 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 8 | Na0.01 (Na1.80Ca0.20)Σ2.00 ( Mg2.24Fe2+0.92Fe3+0.33Al1.52)Σ5.01(Al0.06Si7.94)Σ8.00O22OH2 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Akeyazhi River valley, Ili Kazakh Autonomous Prefecture, Xinjiang, China | Sample from blueschist | |
| 2 | " " | Sample from blueschist | |
| 3 | Sierra de las Minas, Motagua Valley, Guatemala | Sample from jadeitite | |
| 4 | Tianpu, Xin Co., Xinyang, Henan, China | Sample from the core of amphibole grains in jadeite bearing granofels. | |
| 5 | Case Parigi, Martiniana Po, Cuneo Province, Piedmont, Italy | Analyzed sample is a minute inclusion in pyrope from a coesite, phengite, pyrope whiteschist. Mineral analyses were performed by means of the Cameca electron microprobe (CAMEBAX) , using a wavelength-dispersive technique with PAP correction acceleration voltage 15 kV, beam current 15 nA, measuring time 20 s). | |
| 6 | Roadcut Rv 5, Kvineset, Førde, Sunnfjord, Vestland, Norway | Analysis of the core of an eclogite matrix amphibole. EPMA analysis | |
| 7 | " " | Analysis of the rim of an eclogite matrix amphibole. EPMA analysis | |
| 8 | Kovalo eclogites, Kechros, Arriana, Rhodope, Eastern Macedonia and Thrace, Greece | EMPA analysis of an amphibole inclusion in garnet from an eclogite | |
| 9 | Eclogite outcrops, Shang Sumdo région, Leh District, Ladakh, India | EMPA analysis of a blueish early formed amphibole in an eclogite. | |
| 10 | Weiß‑Spitze eclogites, Virgen valley, Lienz District, Tyrol, Austria | Sample from a primary "massive" eclogite. EMPA analysis. |
Crystallography of Glaucophane 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) |
|---|---|---|---|---|---|---|---|
| 0006417 | Glaucophane | Comodi P, Mellini M, Ungaretti L, Zanazzi P F (1991) Compressibility and high pressure structure refinement of tremolite, pargasite and glaucophane European Journal of Mineralogy 3 485-499 | 1991 | 0 | 293 | ||
| 0006416 | Glaucophane | Comodi P, Mellini M, Ungaretti L, Zanazzi P F (1991) Compressibility and high pressure structure refinement of tremolite, pargasite and glaucophane European Journal of Mineralogy 3 485-499 | 1991 | 0 | 293 | ||
| 0006415 | Glaucophane | Comodi P, Mellini M, Ungaretti L, Zanazzi P F (1991) Compressibility and high pressure structure refinement of tremolite, pargasite and glaucophane European Journal of Mineralogy 3 485-499 | 1991 | 0 | 293 | ||
| 0000182 | Glaucophane | Papike J J, Clark J R (1968) The crystal structure and cation distribution of glaucophane American Mineralogist 53 1156-1173 |  | 1968 | 0 | 293 |
CIF Raw Data - click here to close
Synonyms of Glaucophane Root Name Group
Sodic amphibole (in part)
Relationship of Glaucophane Root Name Group to other Species
Other Members of Sodium Amphibole Subgroup:
| Arfvedsonite Root Name Group | ANa2(C2+4Fe3+}Si8O22W2 | Mon. |
| Eckermannite Root Name Group | ANa2(C2+4Al}Si8O22W2 | Mon. |
| Leakeite Root Name Group | ANa2(Z2+2Z3+2Li)(Si8O22)(OH,F,Cl)2 | |
| Nybøite Root Name Group | ANa2(Z2+3Z3+2)(AlSi7O22)(OH,F,Cl)2 | |
| Riebeckite Root Name Group | ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2 | Mon. |
Glaucophane Root Name Group Members:
| Ferro-glaucophane | ◻[Na2][Fe2+3Al2]Si8O22(OH)2 | Mon. 2/m : B2/m |
| Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 | 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.
Glaucophane Root Name Group in petrology
An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.
Internet Links for Glaucophane Root Name Group
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https://www.mindat.org/min-8962.html
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References for Glaucophane Root Name Group
Reference List:
ERNST, W. G. (1963) Petrogenesis of Glaucophane Schists. Journal of Petrology, 4 (1) 1-30 doi:10.1093/petrology/4.1.1
Borg, I. Y. (1967) Optical properties and cell parameters in the glaucophane-riebeckite series. Contributions to Mineralogy and Petrology, 15 (1) 67-92 doi:10.1007/bf01167215
Papike, J. J., Clark, Joan R. (1968) The crystal structure and cation distribution of glaucophane. American Mineralogist, 53 (7-8) 1156-1173
Rio Oremo, Chiavolino, Pollone, Biella Province, Piedmont, Italy