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scoria
This term describes a porous, lightweight rock formed from rapidly cooling lava, characterized by a sponge-like texture due to trapped gas bubbles. It evokes a sense of geological volatility and raw, scorched earth, often associated with volcanic landscapes or the aftermath of an eruption.
In an industrial context, the word shifts from natural geology to metallurgy, referring to the waste byproduct of smelting. Because it is an uncountable mass noun, it does not take a plural form in standard usage; instead, speakers use partitive phrases such as a piece of scoria or layers of scoria to describe specific quantities.
Meanings
Examples
The volcano is primarily composed of red scoria.
Look at these holes in the rock; that is typical of scoria.
The hikers struggled to walk across the loose scoria slope.
I wonder if this scoria was formed during the last eruption.
Ancient smiths often discarded the scoria in heaps behind the forge.
The sample contains a high percentage of iron scoria.
The sample contains a high percentage of iron scoria.
We found fragments of copper scoria near the old mining site.
Is this piece of scoria naturally lightweight or is it porous?