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en.wikipedia.org/wiki/Shales

With continued increase in metamorphic grade the sequence is phyllite, then schist and finally gneiss. Historical mining terminology. Before the mid-19th century, the terms slate, shale and schist were not sharply distinguished. In the context of underground coal mining, shale was frequently referred to as slate well into the 20th century.

csmgeo.csm.jmu.edu/geollab/Fichter/MetaRx/Barmetachanges.html

Beginning with a shale parent, Barrovian metamorphism produces a sequence of metamorphic rocks that goes through slate, and then through phyllite, schist, and gneiss. It can be hard to imagine at first that all these very different looking rocks can come from the same sedimentary parent, but we know that they do.

www.thoughtco.com/shale-rock-4165848

Shale, Slate, and Schist . Increasing pressure and temperature changes shale into slate, which in turn may become phyllite, schist, and gneiss. versh / Getty Images Up to the mid-19th century, the term "slate" was often used to refer to shale, slate, and schist. Underground coal miners may still refer to shale as slate, per tradition.

en.wikipedia.org/wiki/Mica_slate

Before the mid-18th century, the terms slate, shale and schist were not sharply differentiated by those involved with mining. Formation. During metamorphism, rocks which were originally sedimentary, igneous or metamorphic are converted into schists and gneisses. If the composition of the rocks was originally similar, they may be very difficult ...

geology.com/rocks/schist.shtml

To become schist, a shale must be metamorphosed in steps through slate and then through phyllite. If the schist is metamorphosed further, it might become a granular rock known as gneiss. A rock does not need a specific mineral composition to be called “schist.”

quizlet.com/17641795/parent-rocks-of-metamorphic-rocks...

Start studying Parent Rocks Of Metamorphic Rocks. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ... Parent Rock of Slate. Shale/Clay. Parent Rock of Schist. Phyllite/Mica/Slate. Parent Rock of Phyllite. Slate/Mica/Shale. Parent Rock of Marble. Limestone. Parent Rock of Quartzite. Sandstone. ... Parent Rock of ...

csmgeo.csm.jmu.edu/geollab/Fichter/MetaRx/metasimple.html

Shale produces the greatest diversity of metamorphic rocks, so many changes in fact that it is sometimes hard to believe they could all come from the same parent. We can see this in the chart below where sedimentary shale turns into slate, then phyllite, then schist, then gneiss.

quizlet.com/103861378/metamorphic-rocks-flash-cards

Start studying Metamorphic Rocks. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. ... Which rock type represents the highest grade of metamorphism from a shale? Slate. Which rock type represents the lowest grade of metamorphism from a shale? Shale, slate, phyllite, schist, gneiss, partial melting.

itc.gsw.edu/faculty/tweiland/metarx.htm

SLATE. Slate is a low-grade foliated metamorphic rock formed by regional metamorphism. It is similar in appearance to mudstone and shale due to the low grade of metamorphism but can be distinguished by its slaty cleavage and more dense, compact nature. Grade: low; Parent Rock: clay-rich mudstone or shale

geology.com/rocks/slate.shtml

Slate is a fine-grained, foliated metamorphic rock that is created by the alteration of shale or mudstone by low-grade regional metamorphism. The specimen shown above is about two inches (five centimeters) across.