Shale stone close-up. Shale stone is a fine-grained sedimentary rock that is formed when silt and clay are compressed.

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Photo credit: © Vitor_Portugal / Alamy / Afripics
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Keywords: ardósia, calcite, clay, clay-size, construction, design, fine, garden, grains, hardness, materials, minerais, mineral, minerals, mud, mudrock, patterns, pedras, piedras, quartz, rock, rocks, sedimentary, shale, stone, textures, wall