Slate
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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 t
Slate of the Knife Lake Formation in Minnesota
Slate with pyrite
A slate roof in Cardiff, Wales
A slate-faced church and homes in Wurzbach, Germany
Slate (writing)
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A slate is a thin piece of hard flat material, historically slate stone, which is used as a medium for writing on. Writing on a slate is impermanent and easily erased, and the same slate is then reuse
Slate
…formed, or schist. The word "slate" is also used for certain types of object made from slate rock. It may mean a single roofing tile made of slate, or a writing slate, which was traditionally a small, smooth piece of the rock, often framed in wood, used with chalk as a notepad or notice board, and especially for…
Slate with writing from 1894, used in Berlin, Germany, currently at the Museum Europäischer Kulturen
Slate with sponge (~1950)