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Phyllite

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About PhylliteHide

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)


Classification of PhylliteHide

Sub-divisions of PhylliteHide

Pronounciation of PhylliteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Other Language Names for PhylliteHide

French:Phyllades

References for PhylliteHide

Reference List:
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Renard, A. (1883) Recherches sur la composition et la structure des phyllades ardennais. Bulletin du Musée royal d'Histoire naturelle de Belgique, 2, 127.
Fettes et al. (2007) Metamorphic Rocks - A Classification and Glossary of Terms. Cambridge University Press.

Internet Links for PhylliteHide

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