...The rock of Isola is most interesting to the geologist, consisting oflarge fragments of black pumice cemented together by volcanic ashesdeposited under water... 
Hugh Macmillan 「Roman Mosaics」
...The cleft before him had become enormous: itwas a canyon, half filled with pumice and coarse ash...
Charles Willard Diffin 「Two Thousand Miles Below」
...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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