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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 ...

geology.com/rocks/slate.shtml

Slate is a foliated metamorphic rock that forms from the metamorphism of shale.

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

Slate is a low grade metamorphic rock generally formed by the metamorphosis of mudstone / shale, or sometimes basalt, under relatively low pressure and ...

www.softschools.com/facts/geology/slate_facts/389

Slate is a metamorphic rock that forms from mudstone or shale. The mudstone or shale normally contains clay or volcanic ash. Slate is unique in that it does not ...

www.britannica.com/science/slate-geology

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 ...

www.homedepot.com/b/Slate/River-Rock/N-5yc1vZ1z0r6npZ1z0ub7a

Shop our selection of Slate, River Rock, in the Department at The Home Depot.

www.homedepot.com/b/Outdoors-Garden-Center-Landscaping-Landscape-Rocks/Slate/N-5yc1vZbx5dZ1z0ub7a

Shop our selection of Slate, Landscape Rocks in the Outdoors Department at The Home Depot.

www.rocksandminerals4u.com/slate.html

Slate is a fined grained metamorphic rock. Shale is the parent rock. It is made up of clay minerals. Shale can metamorphose into slate, phyllite, schist or gneiss ...

www.pinterest.com/explore/slate-rock

Find and save ideas about Slate rock on Pinterest. | See more ideas about River rock patio, Painted stepping stones and Mosaic walkway.