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
GUID
(UUID V4):
(UUID V4):
96bab220-7e45-444f-a181-7da5e881ef45
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
Associated Minerals Based on Photo Data:
Internet Links for Phyllite
mindat.org URL:
https://www.mindat.org/min-50064.html
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References for Phyllite
Reference List:
Llano County, Texas, USA