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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.

www.britannica.com/science/slate-geology

Slate: Slate, fine-grained, clayey metamorphic rock that cleaves, or splits, readily into thin slabs having great tensile strength and durability; some other rocks that occur in thin beds are improperly called slate because they can be used for roofing and similar purposes. True slates do not, as a rule,

en.wikipedia.org/wiki/Slate

Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. It is the finest grained foliated metamorphic rock.

flexiblelearning.auckland.ac.nz/rocks_minerals/rocks/slate...

Slate Slate is a low grade metamorphic rock generally formed by the metamorphosis of mudstone / shale, or sometimes basalt, under relatively low pressure and temperature conditions.Clay minerals in the parent rock metamorphose into mica minerals ( biotote, chlorite, muscovite) which are aligned along foliation planes perpendicular to the direction of pressure.

geology.com/rocks/metamorphic-rocks.shtml

Slate is a foliated metamorphic rock that is formed through the metamorphism of shale. It is a low-grade metamorphic rock that splits into thin pieces. ... The Geology.com store offers inexpensive rock collections that can be mailed anywhere in the United States or U.S. Territories. Mineral collections and instructive books are also available.

geologylearn.blogspot.com/2015/04/slate.html

Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. It is the finest grained foliated metamorphic rock. Foliation may not correspond to the original sedimentary layering, but instead is in planes perpendicular to the direction of metamorphic compression.

newenglandslate.com/roofing-slate/geology-history

Geology. The origins of slate go back 450 to 600 million years when very fine clay silts were deposited at the bottom of riverbeds, lakes and seas.

en.wikipedia.org/wiki/Slate_Islands_(Ontario)

The Slate Islands archipelago is formed of two main islands, five minor islands and numerous islets located in northern Lake Superior, 10 kilometres (6 mi) south of the town of Terrace Bay.The islands were created by a meteorite impact which formed a crater about 32 km (20 mi) wide. In 1985, the Ontario government established the Slate Islands as a natural environment provincial park.

www.thoughtco.com/shale-rock-4165848

Shale is the most common sedimentary rock, accounting for about 70 percent of the rock found in the Earth's crust.It is a fine-grained clastic sedimentary rock made of compacted mud consisting of clay and tiny particles of quartz, calcite, mica, pyrite, other minerals, and organic compounds.Shale is found all over the world in areas where water exists or once flowed.

www.reference.com/science/difference-between-shale-slate-a...

Home Science Earth Science Geology. ... What Is the Difference Between Shale and Slate? Shale is a sedimentary rock while slate is a metamorphic rock formed from shale. Slate is much more durable than shale due to the metamorphic process it undergoes. Slate and shale are similar in appearance. Visually, it can be hard to tell the two apart.