Fibrolite
A variety of Sillimanite
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About Fibrolite
Formula:
Al2(SiO4)O
Name:
Named in 1802 by Jacques Louis Comte de Bournon because of its fibrous habit. Although fibrolite has priority over sillimanite, the two species were not ultimately recognized as the same species until about 1854 by James Dwight Dana. Despite Dana's adherence to issues of priority, the concept of polymorphism took many years to be fully adopted. Previously, Dana had even relegated kyanite to being a variety of sillimanite. Benjamin Silliman Sr. was also James Dwight Dana's father-in-law.
First Recorded Locality:
A name for the fibrous form of sillimanite. Fibrolite is generally white to pale yellow and may occur in parallel bundles of fibers that seem to conform to the geometry of adjacent minerals, often in a gentle sweep of bent crystals. Fibrolite is by far the most common variety of sillimanite.
Visit gemdat.org for gemological information about Fibrolite.
Visit gemdat.org for gemological information about Fibrolite.Unique Identifiers
Mindat ID:
6252 (as Fibrolite)
3662 (as Sillimanite)
3662 (as Sillimanite)
Long-form identifier:
mindat:1:1:6252:3 (as Fibrolite)
mindat:1:1:3662:3 (as Sillimanite)
mindat:1:1:3662:3 (as Sillimanite)
Similar Names
| Fibrolit | A synonym of Sillimanite |
Chemistry of Fibrolite
Mindat Formula:
Al2(SiO4)O
Element Weights:
Elements listed:
First Recorded Occurrence of Fibrolite
Common Associates
Associations Based on Photo Data:
| 4 photos of Fibrolite associated with Sillimanite | Al2(SiO4)O |
| 2 photos of Fibrolite associated with K Feldspar | |
| 2 photos of Fibrolite associated with Almandine | Fe2+3Al2(SiO4)3 |
| 2 photos of Fibrolite associated with Hematite | Fe2O3 |
| 1 photo of Fibrolite associated with Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| 1 photo of Fibrolite associated with Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| 1 photo of Fibrolite associated with Quartz | SiO2 |
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 Fibrolite
mindat.org URL:
https://www.mindat.org/min-6252.html
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Please feel free to link to this page.
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References for Fibrolite
Localities for Fibrolite
Showing 46 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.
Antarctica | |
| Abdrakhmanov et al. (2024) |
| Thomson (1974) |
Argentina | |
| Rapela et al. (2002) |
Austria | |
| Firtsch (1907) |
Canada | |
| Nielsen (1977) |
| Grant (2009) |
| Steadman et al. (2015) |
Chile | |
| Miranda-Díaz et al. (2022) |
China | |
| He et al. (2024) |
France | |
| Lukas (1978) +1 other reference |
India | |
| Goswami et al. (2024) |
| Rout et al. (2022) |
| Jacques Louis Comte de Bournon (1802) |
Iran | |
| Mikaeili et al. (2025) |
Italy | |
| Bonardi et al. (1984) |
| Bonardi et al. (1984) |
| Bonardi et al. (1984) |
| Bonardi et al. (1984) | |
| Bonardi et al. (1984) |
| Rottura et al. (1993) |
| Meli et al. (2003) |
Japan | |
| Shiba (1982) |
Madagascar | |
| Tang et al. (2019) |
Morocco | |
| Afiri et al. (2023) |
Myanmar | |
| Themelis (2008) |
| Themelis (2008) | |
| Themelis (2008) |
| Themelis (2008) | |
| Themelis (2008) | |
Poland | |
| Lis et al. (1986) |
| Lis et al. (1986) |
| Lis et al. (1986) |
| Gnadenfrei [Piława Górna] +3 other references |
Portugal | |
| According to pioneer work carried out in the 1950s by C.T Assunção & C.Teixeira (Boletim do Museu e Laboratório Mineralógico e Geológico Faculdadede Ciências, 1954, v.27, pp.7–17) |
| Leal et al. (2022) |
Spain | |
| I.G.M.E. (1991) +1 other reference |
| www.igme.es (2015) +4 other references | |
| Merino et al. (2013) |
Ukraine | |
| Poliakovska et al. (2023) |
USA | |
| Beste (2005) |
| Kunz (1886) |
| Wood (1996) |
| Speer (1997) |
| Speer (1987) |
| Speer (1987) | |
| Speer (1987) |
Wilmington, New Castle County, Delaware, USA