...The cleft before him had become enormous: itwas a canyon, half filled with pumice and coarse ash... 
Charles Willard Diffin 「Two Thousand Miles Below」
...And now Smithy stood like a rigid carven statue in the midst of a barrensandy waste in the vast cup of a towering volcano top—sand that wasin reality coarse pumice and ash...
Charles Willard Diffin 「Two Thousand Miles Below」
...The whole of the island bears the strongest marks of beinga volcanic production, having great quantities of pumice stone onit, and the rocks quite burnt up...
Arthur Phillip 「The Voyage Of Governor Phillip To Botany Bay」
...Proceeding up the opening, I found it to be more than a mile in width; and from thequantities of pumice stone on the borders, it was named Pumice-stone River...
Matthew Flinders 「A Voyage to Terra Australis」
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