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How is slate formed from shale?

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How Does Slate Form? The tectonic environment for producing slate is usually a former sedimentary basin that becomes involved in a convergent plate boundary. Shales and mudstones in that basin are compressed by horizontal forces with minor heating. read more

Slate is composed of many of the same minerals that make up shale. When shale is heated and put under heavy pressure from tectonic plate activity, the clay minerals inside the rock revert to mica. This gives the new rock the ability to break apart, or cleave, along flat planes. read more

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. read more

Slate is formed by a metamorphosis of clay, shale and volcanic ash that results to a fine-grained foliated rock, resulting in unique slate textures. It is a metamorphic rock, being the finest grained foliated of its kind. read more

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