Fan stone

Japanese: 煽石 - せんせき

〘Noun〙 Coal from underground coal seams is carbonized by the heat of volcanic rocks and turned into coke. It is less homogeneous and has a higher ash content than regular anthracite or coke, making it harder to use. Depending on the degree of alteration, it is given the common names of Hashiri, Okori, Chikura, etc. It is produced in the Chikuho and Amakusa coalfields. *Tokyo Nichi Nichi Shimbun - December 15, 1873 (Meiji 6) "A man named Yamamoto Bunji plans to open a trading company for burning lime using fan stones in the Tokyo suburbs."

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙地下の炭層中の石炭が、火山岩の熱で乾留されてコークス化したもの。ふつうの無煙炭やコークスよりも、均質でなく灰分も多く、利用しにくい。変質度によって、はしり・おこり・ちくらなどの俗称がある。筑豊炭田・天草炭田などに産出した。※東京日日新聞‐明治六年（1873）一二月一五日「山本文治と云人、煽石にて石灰焼方の商社を都下に開かんとす」

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