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Phyllite
A rock classification type
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About Phyllite
A fine to medium-grained metamorphic rock characterised by a strong foliation and a lustrous sheen. It is intermediate in grade between slate and schist. Minute crystals of sericite /muscovite and/or chlorite impart a silky sheen to the surfaces of cleavage (or schistosity). Phyllites commonly exhibit corrugated/crenulated cleavage surfaces.
The protolith (or parent rock) for phyllite is usually shale or pelite, via slate. Its constituent platy minerals are larger than those in slate but are not visible with the naked eye. Phyllites are formed through low-grade regional metamorphism.
Compare with: phyllonite
The term is also sometimes used by some French authors for the scaly phyllosilicate minerals, such as micas, chlorites, clays, and vermiculites. (AGI)
The protolith (or parent rock) for phyllite is usually shale or pelite, via slate. Its constituent platy minerals are larger than those in slate but are not visible with the naked eye. Phyllites are formed through low-grade regional metamorphism.
Compare with: phyllonite
The term is also sometimes used by some French authors for the scaly phyllosilicate minerals, such as micas, chlorites, clays, and vermiculites. (AGI)
Unique Identifiers
Mindat ID:
50064
Long-form identifier:
mindat:1:1:50064:9
Classification of Phyllite
Sub-divisions of Phyllite
Pronunciation of Phyllite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Other Language Names for Phyllite
French:Phyllades
Common Associates
Associations Based on Photo Data:
| 5 photos of Phyllite associated with Andalusite | Al2(SiO4)O |
| 5 photos of Phyllite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 5 photos of Phyllite associated with Chlorite Group | |
| 5 photos of Phyllite associated with 'Spotted slate' | |
| 3 photos of Phyllite associated with Quartz | SiO2 |
| 3 photos of Phyllite associated with 'Marble' | |
| 2 photos of Phyllite associated with 'White mica' | |
| 2 photos of Phyllite associated with 'Coticule' | |
| 2 photos of Phyllite associated with Cordierite | Mg2Al4Si5O18 |
| 1 photo of Phyllite associated with Goethite | Fe3+O(OH) |
Internet Links for Phyllite
mindat.org URL:
https://www.mindat.org/min-50064.html
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References for Phyllite
Reference List:
Naviser Reckner, Navis, Innsbruck-Land District, Tyrol, Austria