Ferrikatophorite-Katophorite Series
A solid-solution series between two end-member minerals
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About Ferrikatophorite-Katophorite Series
Series Formula:
Na(NaCa)(Fe42+Fe3+)(Si7Al)O22(OH)2 to {Na}{CaNa}{Fe42+Al}[(AlSi7)O22](OH)2
Unique Identifiers
Mindat ID:
39240
Long-form identifier:
mindat:1:1:39240:2
Chemical Analysis
Oxide wt%:
| 1 | 2 | 3 | 4 | 5 | 6 | |
|---|---|---|---|---|---|---|
| SiO2 | 45.72 % | 44.18 % | 39.09 % | 46.42 % | 43.12 % | 48.86 % |
| TiO2 | 1.69 % | 2.05 % | 1.9 % | 0.5 % | 0.47 % | 0.39 % |
| ZrO2 | 0.03 % | |||||
| Al2O3 | 2.79 % | 5.68 % | 9.31 % | 10.75 % | 15.28 % | 11.18 % |
| Ga2O3 | 0.01 % | |||||
| V2O3 | 0.01 % | |||||
| Cr2O3 | 0.01 % | |||||
| Fe2O3* | 4.15 % | |||||
| FeO* | 27.17 % | |||||
| MnO* | 2.39 % | |||||
| ZnO | 0.14 % | |||||
| MgO | 1.91 % | 5.29 % | 3.67 % | 8.59 % | 7.22 % | 7.47 % |
| CaO | 5.67 % | 7.64 % | 8.83 % | 7.56 % | 6.5 % | 2.93 % |
| SrO | 0.02 % | |||||
| BaO | 0.02 % | |||||
| Na2O | 5.15 % | 5.05 % | 3.76 % | 4.19 % | 5.98 % | 7.95 % |
| K2O | 1.18 % | 1.63 % | 1.46 % | 0.18 % | 0.74 % | 0.37 % |
| F | 1.37 % | |||||
| Cl | 0.06 % | |||||
| H2O (by stoichiometry) | 0.80 % | |||||
| -O=F+Cl | -0.59 % | |||||
| Fe2O3 | 5.29 % | 2.64 % | ||||
| FeO | 21.03 % | 27.11 % | 19.5 % | 15.01 % | 17.28 % | |
| MnO | 1.46 % | 1.27 % | 0.18 % | 0.59 % | ||
| NiO | 0.09 % | |||||
| H2O | 2.01 % | 2.02 % | ||||
| Total: | 99.7 % | 99.3 % | 96.4 % | 97.96 % | 99.56 % | 98.45 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Na0.75K0.24)(Ca0.98Na0.87Mn2+0.15)(Fe2+3.68Mg0.46Fe3+0.45Ti0.21Mn2+0.18Zn0.02)[Si7.41Al0.53Fe3+0.06O22]([OH]0.87F0.70O0.41Cl0.02) |
| 4 | (Na0.593K0.034)Σ0.627(Ca1.203Na0.613Fe0.162Mn0.023)Σ2.001(Fe2+1.938Mg1.901Al0.773Fe3+0.322Ti0.056Ni0.011)Σ5.001(Si6.892Al1.108)Σ8O22((OH)1.888O0.112)Σ2 |
| 6 | (Na0,798K0,07)?0,868 (Na1,489Ca0,466Fe0,045)?2 (Feii2,02Mg1,652Al1,205FeIII0,08Ti0,044)?5,001 (Si7,25Al0,75)?8 O22 ((OH)1,999O0,001)?2 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Água de Pau Volcano, São Miguel, Azores, Portugal | Slightly brighter BSE-Z outermost rim of weakly zoned amphibole. The main portion of the crystals grade to ferro-ferri-fluoro-katophorite (compare with pts. 76 and 90). EPMA data normalized to ∑cations = 16. *valences of Fe and Mn calculated by normalization-imposed charge balance. X-site oxygen calculated from 2*Ti, with OH calculated from stoichiometry. | |
| 2 | Motzfeldt Centre, Igaliku Complex, Kujalleq, Greenland | Sample from nepheline-syenite. When normalized, the analysis yields a low C value and a high A value. This often symptomatic for amphiboles containing undetected Li. | |
| 3 | Marinkas Kwela, Karasburg West, ǁKaras Region, Namibia | Sample from a foyaite | |
| 4 | Engebøfjellet Eclogite Deposit, Naustdal, Sunnfjord, Vestland, Norway | Amphibole found as inclusion in garnet. 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. | |
| 5 | Sierra de las Minas, Motagua Valley, Guatemala | Sample from retrograded eclogite | |
| 6 | Isasca, Cuneo Province, Piedmont, Italy | Tropper et al. (2000) prints the analyses given as ferro-nybøite by : T. Hirajima and R. Compagnoni : "Petrology of a jadeite-quartz-almandine-phengite fels with retrograde ferro-nyböite from the Dora-Maira Massif, Western Alps", Eur. Journ. Mineral., 1993, 5, pp 943-955 The analyses normalizes to ferro-katophorite, see https://www.mindat.org/locentry-769804.html |
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 Ferrikatophorite-Katophorite Series
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References for Ferrikatophorite-Katophorite Series
Localities for Ferrikatophorite-Katophorite Series
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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.
Água de Pau Volcano, São Miguel, Azores, Portugal