variolites
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Example Sentences
Example:Tephrites and variolites are similar in their composition and origin, both representing volcanic ash rocks that have gone through specific geological processes.
Definition:A rock formed from volcanic ash that has undergone partial melting and can contain both feldspar and quartz.
From tephrites
Example:While variolites and pumices share a volcanic origin, their textures and compositions differ; variolites are more compact and less vesicular.
Definition:A lightweight rock that is filled with holes (vesicles) formed when gas bubbles are trapped during the cooling of lava.
From pumices
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