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Fahlunite
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About Fahlunite
Formula:
(Mg,Fe)Al2Si3O10 · 2H2O
An alteration product of cordierite (compare also pinite).
Originally described from Falu mine, Falun, Dalarna, Sweden.
Originally described from Falu mine, Falun, Dalarna, Sweden.
Unique Identifiers
Mindat ID:
1438
Long-form identifier:
mindat:1:1:1438:6
Similar Names
| Fahlunite (of Karsten) | A synonym of Gahnite |
| Fullonite | A synonym of Goethite |
Chemistry of Fahlunite
Mindat Formula:
(Mg,Fe)Al2Si3O10 · 2H2O
Element Weights:
Synonyms of Fahlunite
Other Language Names for Fahlunite
Common Associates
Associations Based on Photo Data:
| 9 photos of Fahlunite associated with Cordierite | Mg2Al4Si5O18 |
| 7 photos of Fahlunite associated with Quartz | SiO2 |
| 4 photos of Fahlunite associated with Columbite-(Fe) | Fe2+Nb2O6 |
| 4 photos of Fahlunite associated with Spessartine | Mn2+3Al2(SiO4)3 |
| 4 photos of Fahlunite associated with Albite | Na(AlSi3O8) |
| 4 photos of Fahlunite associated with Chrysoberyl | BeAl2O4 |
| 3 photos of Fahlunite associated with 'Cleavelandite' | Na(AlSi3O8) |
| 3 photos of Fahlunite associated with 'Smoky Quartz' | SiO2 |
| 2 photos of Fahlunite associated with Zircon | Zr(SiO4) |
| 2 photos of Fahlunite associated with Beryl | Be3Al2(Si6O18) |
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 Fahlunite
mindat.org URL:
https://www.mindat.org/min-1438.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Fahlunite
Reference List:
Localities for Fahlunite
Showing 8 localities.
symbol to view information about a locality.
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.
Austria | |
| Exel (1993) |
Sweden | |
| Hisinger (1815) +1 other reference |
USA | |
| Jim G. Ferguson (1922) |
| Shepard (1841) |
| Williams (1899) | |
| Shepard (1841) +2 other references | |
| Ted Johnson collection |
| pnwfm.org (2004) |
Timms Hill, Haddam, Middlesex County, Connecticut, USA