https://en.wikipedia.org/wiki/Slate

Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original .... In some cases slate was used by the ancient Maya civilization to fashion stelae. Slate was traditional material of choice for black Go stones in Japan.

https://geology.com/rocks/slate.shtml

Slate is a foliated metamorphic rock that forms from the metamorphism of shale. ... Slate also occurs in shades of green, red, black, purple, and brown. The color ...

https://www.amazon.com/Black-Gray-Slate-Metamorphic-Rock-inches/dp/B010GEMVXS

Black-Gray Slate Metamorphic Rock 1-2 inches - 2 Pieces: Amazon.com: Industrial & Scientific.

https://www.pinterest.com/bazowski/slate-rock/

Explore JEAN BAZOWSKI's board "Slate rock" on Pinterest. See more ... See more. Black Slate Rock (per LB) On Sale $9.90 Slate Rock, Aquarium Decorations, ...

https://aquaticarts.com/products/natural-black-slate-rock-aquarium-terrarium-bonsai-stone

Black Slate is a metamorphic sedimentary rock that is derived from shale and is very popular in aquarium decoration. This rock is flat and perfect for caves.

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

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

https://www.homedepot.com/b/Outdoors-Garden-Center-Landscaping-Hardscapes-Landscape-Rocks/Black/N-5yc1vZbx5dZ1z0vm5i

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

https://www.britannica.com/science/slate-geology

Slate: Slate, fine-grained, clayey metamorphic rock that cleaves, or splits, readily into thin slabs having ... Slates may be black, blue, purple, red, green, or gray.

https://miningmatters.ca/school-programs/students/rock-and-mineral-identification-guides/rock-identification-guide

Distinguishing Characteristics: red-brown to black, frothy with small visible holes .... Slate. Slate. Rock Type: metamorphic. Composition: clay minerals. Original ...

http://www.worldofstones.com/blog/limestone-and-black-slate/

Sep 1, 2017 ... Limestone and Black Slate:Limestone is a sedimentary rock where as Slate is a fine-grained, foliated, homogeneous metamorphic rock.