scoria

• Making his painful way across the scoria, or metallic rock froth, he had breathed no more than was imperative But even this little was too much. —  034 - The Fantastic Island
• The practically trained eye could see the scoria which indicates the defective welding. —  James Nasmyth: Engineer, An Autobiography.
• Lothspeich said he is open to selling the subsurface rights, which include "coal, scoria, uranium, sand, gravel, the whole works," to anyone who gives him $2.5 million. —  Philly.com - Latest Videos
• The combination of the wood condensing due to the pressure of carving and the paint layer on the letters has meant that the surrounding wood has been more susceptible to abrasion by the wind and scoria, so the inscription now actually stands proud, and is in danger of shearing off from the cross. —  Museum Blogs
• The scoria is loose and gravelly, and covered in weird fern-like creepers.

Allen's Synonyms and Antonyms

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