Jisho

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せっこう 石膏
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Noun, Noun which may take the genitive case particle 'no'
1. plaster; gypsum; calcium sulphate (sulfate)​
Wikipedia definition
2. Gypsum​Gypsum is a very soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is found in alabaster, a decorative stone used in Ancient Egypt. It is the second softest mineral on the Mohs scale of mineral hardness. It forms as an evaporite mineral and as a hydration product of anhydrite.
Read “Gypsum” on English Wikipedia
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Read “Gypsum” on DBpedia
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石こう 【せっこう】

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