Jisho

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Noun
1. gangue; veinstoneSee also 鉱石
Wikipedia definition
2. GangueIn mining, gangue is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit. The separation of mineral from gangue is known as mineral processing, mineral dressing or ore dressing and it is a necessary and often significant aspect of mining. It can be a complicated process, depending on the nature of the minerals involved.
Read “Gangue” on English Wikipedia
Read “脈石” on Japanese Wikipedia
Read “Gangue” on DBpedia

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