![](https://nthumb.tpgimages.com/mid2_com_img/28103/24007/TOP22076922.jpg)
Two kinds of coal: anthracite, on the left, and bituminous, on the right. Anthracite is harder, denser, and more lustrous, with more carbon and fewer impurities than bituminous.
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Creative#:
TOP22076922
Source:
達志影像
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RM
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須由TPG 完整授權
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