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Coal essence, also known as coal jade, is a unique type of saprobe coal predominantly found in the open-pit mines of Fushun, Liaoning Province. With its fine texture and remarkable toughness, this rare material is transformed into exquisite works of art. Reference Link:- https://english.news.cn/20250413/5b91fb5ce91b43a9b14e89a47e8a635d/c.htmlContinue Reading