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| bituminous limestone ： ウィキペディア英語版 |
bituminous limestone
Bituminous limestone is limestone impregnated and sometimes deeply colored with bituminous matter derived from the decomposition of animal and plant remains entombed within the mass or in its vicinity.
==Uses==
The amount of bituminous matter or asphalt in the pores of the rock is sometimes sufficient to permit the material being used for asphalt pavements after simply powdering and heating it. Still better results are obtained by mixing it with bituminous sandstone.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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