Jisho

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ねんばんがん 粘板岩
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Noun
1. clay rock; slate​
Wikipedia definition
2. 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. The result is a foliated rock in which the foliation may not correspond to the original sedimentary layering. When expertly "cut" by striking with a specialized tool in the quarry, many slates will form smooth flat sheets of stone which have long been used for roofing and floor tiles and other purposes.
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Read “Slate” on DBpedia

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