Winchite Root Name Group
A group of related mineral species
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About Winchite Root Name Group
Formula:
◻(CaNa)(C2+4C3+)(Si8O22)W2
The winchite minerals are defined as sodium-calcium amphiboles with A(Na+K+ 2Ca)<0,5 apfu and with C(Al+Fe3++2Ti)<1,5 apfu.
The various species are defined on their dominant elements in the C and W position in the formula
C2+ position: Mg or Fe dominant
C3+ position: Al or Fe dominant
W position: (OH) or F dominant.
The various species are defined on their dominant elements in the C and W position in the formula
C2+ position: Mg or Fe dominant
C3+ position: Al or Fe dominant
W position: (OH) or F dominant.
Crystal System:
Monoclinic
This page provides mineralogical data about Winchite Root Name Group.
Unique Identifiers
Mindat ID:
8624
Long-form identifier:
mindat:1:1:8624:6
Chemistry of Winchite Root Name Group
Mindat Formula:
◻(CaNa)(C2+4C3+)(Si8O22)W2
The winchite minerals are defined as sodium-calcium amphiboles with A(Na+K+ 2Ca)<0,5 apfu and with C(Al+Fe3++2Ti)<1,5 apfu.
The various species are defined on their dominant elements in the C and W position in the formula
C2+ position: Mg or Fe dominant
C3+ position: Al or Fe dominant
W position: (OH) or F dominant.
The winchite minerals are defined as sodium-calcium amphiboles with A(Na+K+ 2Ca)<0,5 apfu and with C(Al+Fe3++2Ti)<1,5 apfu.
The various species are defined on their dominant elements in the C and W position in the formula
C2+ position: Mg or Fe dominant
C3+ position: Al or Fe dominant
W position: (OH) or F dominant.
Chemical Analysis
Oxide wt%:
Showing 12 of 20 analyses on this page.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SiO2 | 48.36 % | 48.82 % | 49.8 % | 51.83 % | 50.62 % | 53.26 % | 54.17 % | 56.26 % | 53.36 % | 55.07 % | 50.37 % | 55.88 % |
| TiO2 | 1.02 % | 0.24 % | .24 % | 0.15 % | 0.22 % | 0.24 % | 0.21 % | 0.11 % | 0.06 % | 0.19 % | 0.11 % | |
| Al2O3 | 1.42 % | 11.44 % | 10.69 % | 8.40 % | 11.34 % | 7.9 % | 9.75 % | 7.74 % | 7.91 % | 6.16 % | 9.40 % | 0.53 % |
| Fe2O3 | 7.48 % | |||||||||||
| FeO | 25.34 % | 7.84 % | 16.02 % | 15.86 % | 11.35 % | 5.8 % | 5.65 % | 6.35 % | 5.66 % | 5.20 % | 10.22 % | 8.99 % |
| MnO | 2.07 % | 0.16 % | 0.03 % | 0.08 % | 0.03 % | 0.03 % | 0.03 % | 0.09 % | 0.06 % | 0.10 % | 0.44 % | |
| MgO | 1 % | 14.97 % | 10.58 % | 11.53 % | 12.55 % | 17.84 % | 16.32 % | 16.14 % | 17.84 % | 18.70 % | 14.31 % | 12.77 % |
| CaO | 4.2 % | 8.67 % | 5.15 % | 4.82 % | 6.56 % | 7.41 % | 5.11 % | 7.43 % | 8.95 % | 9.58 % | 7.61 % | 5.71 % |
| Na2O | 4.93 % | 3.56 % | 5.07 % | 4.84 % | 4.91 % | 3.84 % | 5.76 % | 3.60 % | 3.10 % | 2.26 % | 3.89 % | 4.12 % |
| K2O | 0.73 % | 0.4 % | 0.32 % | 0.49 % | 0.2 % | 0.39 % | 0.26 % | 0.17 % | 0.33 % | 0.18 % | 0.17 % | |
| Cr2O3 | 0.01 % | 0.04 % | 0.02 % | 0.10 % | 0.11 % | 0.07 % | ||||||
| NiO | 0.05 % | 0.05 % | 0.11 % | 0.11 % | ||||||||
| F | 0.17 % | 0.04 % | 0.01 % | |||||||||
| Cl | 0.48 % | 0.03 % | 0.01 % | |||||||||
| A12O3 | ||||||||||||
| FeO2 | ||||||||||||
| Sc2O3 | 9.22 % | |||||||||||
| H2O+ | 2.09 % | |||||||||||
| Total: | 96.55 % | 96.81 % | 97.9 % | 98 % | 97.83 % | 96.93 % | 97.41 % | 97.52 % | 97.29 % | 97.53 % | 96.34 % | 100.03 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 13 | (Na0.142◻0.858)(Na1.061Ca0.588Fe2+0.304Mn2+0.047)(Mg2.526Fe2+1.458Al0.584Fe3+0.428Ti0.004)(Si7.915Al0.085)O22((OH)1.983O0.017) |
| 14 | (Na0.428K0.053)Σ0.481(Ca1.31Na0.587Fe0.085Mn0.018)Σ2(Mg2.53Fe2+1.161Al1.104Fe3+0.182Ti0.018Cr0.005)Σ5(Si6.815Al1.185)Σ8O22((OH)1.963O0.037)Σ2 |
| 15 | Na0.02(Na0.50Ca1.50)Σ2.00( Mg3.89Fe2+0.41Fe3+0.16Al0.54)Σ5.00(Al0.20Si7.80)Σ8.00O22OH2 |
| 8 | Na0.05(Na1.09Ca0.91)Σ2.00 ( Mg3.30Fe2+0.56Fe3+0.17Al0.97)Σ5.00(Al0.28Si7.72)Σ8.00O22OH2 |
| 16 | Na0.28 (Na0.62Ca1.38)Σ2.00 ( Mg2.17Fe2+1.74Fe3+0.04Al1.05)Σ5.00(Al0.75Si7.25)Σ8.00O22OH2 |
| 9 | (Na0.17 K0.03 )Σ0.20 (Na0.66Ca1.34)Σ2.00 ( Mg3.71 Mn0.01Fe0.66Cr0.01Ti0.01Al0.72)Σ5.12(Al0.57Si7.43)Σ8.00O22OH2 |
| 17 | (Na0.39 K0.04 )Σ0.44 (Na0.76Ca1.24)Σ2.00 ( Mg2.47 Mn0.01Fe1.66Cr0.02Ti0.01Al0.98)Σ5.12(Al1.07Si6.93)Σ8.00O22OH2 |
| 10 | (Na0.03 K0.06 )Σ0.20 (Na0.58Ca1.42)Σ2.00 ( Mg3.86Mn0.07Fe0.60Cr0.01Ti0.01Al0.64)Σ5.19(Al0.37Si7.63)Σ8.00O22OH2 |
| 12 | A(◻0.97K0.03Na0.003)BΣ1(Na1.13Ca0.87)CΣ2(Mg2.70Fe2+1.06Mn0.05Sc1.14Al0.02Ti0.01)TΣ4.99(Si7.94Al0.07)Σ8.00O22(OH)2 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Marinkas Kwela, Karasburg West, ǁKaras Region, Namibia | Sample from a granite | |
| 2 | Betic ophiolite, Cóbdar, Almería, 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 amphibole vein in a metabasalt |
| 3 | Roadcut Rv 5, Kvineset, Førde, Sunnfjord, Vestland, Norway | Amphibole inclusions from the rim of an eclogite facies garnet. EPMA analysed sample normalized with 13 cations | |
| 4 | " " | Eclogite facies matrix amphibole, composition from Rim of a crystal. EPMA analysed, | |
| 5 | Engebøfjellet Eclogite Deposit, Naustdal, Sunnfjord, Vestland, Norway | Analysis of eclogite facies matrix amphibole in leuco-eclogite | |
| 6 | Nybø eclogite pod, Sørpollen, Vågsøy, Kinn, Vestland, Norway | Matrix amphibole in eclogite. The sample is analysed using the average of multi-point EDS and WDS and single crystal X-ray. The results herein is the average of 5 WDS results. | |
| 7 | " " | Matrix amphibole in eclogite. The sample is analysed using the average of multi-point EDS and WDS and single crystal X-ray. The results herein is the average of 5 WDS results. | |
| 8 | Charakoma eclogite, Soufli, Evros, Eastern Macedonia and Thrace, Greece | EMPA analaysis of an amphibole inclusion in garnet from a kyanite-eclogite | |
| 9 | Steinsteg eclogite, Frosnitz valley, Matrei in Osttirol, Lienz District, Tyrol, Austria | EMPA analysis of matrix amphibole from a kyanite-eclogite | |
| 10 | " " | EMPA analysis of the core of an amphibole grain in post-eclogite-facies mica schist | |
| 11 | Eclogite outcrops, Shang Sumdo région, Leh District, Ladakh, India | EMPA analysis of a matrix amphibole in an eclogite. | |
| 12 | Pieczka, Adam, Stachowicz, Marcin, Zelek-Pogudz, Sylwia, Gołębiowska, Bożena, Sęk, Mateusz, Nejbert, Krzysztof, Kotowski, Jakub, Marciniak-Maliszewska, Beata, Szuszkiewicz, Adam, Szełęg, Eligiusz, Stadnicka, Katarzyna M., Woźniak, Krzysztof (2024) Scandio-winchite, ideally ☐(NaCa)(Mg4Sc)(Si8O22)(OH)2: The first Sc-dominant amphibole-supergroup mineral from Jordanów Śląski, Lower Silesia, southwestern Poland. American Mineralogist, 109 (5) 940-948 doi:10.2138/am-2023-8974 | holotype crystal, by EPMA-WDS; empirical formula basis: 22 oxide anions and and 2 OH anions | |
| 13 | Blueschist occurrence, Pinchi Lake, Omineca Mining Division, British Columbia, Canada | ||
| 14 | Engebøfjellet Eclogite Deposit, Naustdal, Sunnfjord, Vestland, Norway | Matrix amphibole in eclogite. Formula normalized by use of Locock, A. J. (2014). An Excel spreadsheet to classify chemical analyses of amphiboles following the IMA 2012 recommendations. Computers & Geosciences, 62, 1-11. | |
| 15 | Charakoma eclogite, Soufli, Evros, Eastern Macedonia and Thrace, Greece | Matrix amphibole from a kyanite-eclogite. Matrix amphiboles with similar compositions has formed both before and after omphacite. The composition is close to the border between tremolite and winchite, but should be considered winchite based on the 2012 nomenclature report. EMPA analysis. | |
| 16 | Kovalo eclogites, Kechros, Arriana, Rhodope, Eastern Macedonia and Thrace, Greece | EMPA analysis of an amphibole inclusion in an eclogite garnet. | |
| 17 | Steinsteg eclogite, Frosnitz valley, Matrei in Osttirol, Lienz District, Tyrol, Austria | EMPA analysis of an amphibole inclusion in garnet from a kyanite-eclogite. |
Crystallography of Winchite 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) |
|---|---|---|---|---|---|---|---|
| 0020108 | Winchite | Jenkins D M, Della Ventura G, Oberti R, Bozhilov K (2013) Synthesis and characterization of amphiboles along the tremolite-glaucophane join American Mineralogist 98 588-600 | 2013 | synthetic | 0 | 293 | |
| 0020107 | Winchite | Jenkins D M, Della Ventura G, Oberti R, Bozhilov K (2013) Synthesis and characterization of amphiboles along the tremolite-glaucophane join American Mineralogist 98 588-600 | 2013 | synthetic | 0 | 293 | |
| 0005710 | Winchite | Sokolova E V, Hawthorne F C, Gorbatova V, McCammon C, Schneider J (2001) Ferrian winchite from the Ilmen mountains, southern Urals, Russia and some problems with the current scheme for amphibole nomenclature adjusted to match reported bond lengths The Canadian Mineralogist 39 171-177 | ![]() | 2001 | Ilmen mountains, southern Urals, Russia | 0 | 293 |
| 0007426 | Winchite | Ghose S, Kersten M, Langer K, Rossi G, Ungaretti L (1986) Crystal field spectra and Jahn Teller effect of Mn3+ in clinopyroxene and clinoamphiboles from India Physics and Chemistry of Minerals 13 291-305 | 1986 | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Winchite Root Name Group to other Species
Member of:
Other Members of Sodium-Calcium Amphibole Subgroup:
| Barroisite Root Name Group | ◻(CaNa)(C2+3C3+2)(AlSi7O22)W2 | |
| 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 Members:
| Ferri-winchite | ◻(NaCa)(Mg4Fe3+)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 'Ferro-ferri-winchite' | ◻(CaNa)(Fe2+4Fe3+)Si8O22(OH)2 | |
| 'Ferro-winchite' | ◻(CaNa)(Fe2+4Al)(Si8O22)(OH)2 | Mon. |
| 'Fluoro-winchite' | ◻(CaNa)(Mg4Al)(Si8O22)F2 | |
| Scandio-winchite | ◻(NaCa)(Mg4Sc)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| Winchite | ◻(CaNa)(Mg4Al)(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.
Internet Links for Winchite Root Name Group
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References for Winchite Root Name Group
Localities for Winchite Root Name Group
Showing 139 localities.
Locality List
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(TL) - Type Locality for a valid mineral species.
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All localities listed without proper references should be considered as questionable.




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Franklin Mine, Franklin, Sussex County, New Jersey, USA