Example Sentences

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In addition to the reddish or brownish argillaceous matrix it contains fresh or decomposed crystals of volcanic minerals, such as felspar, augite, hornblende, olivine and pumiceous or palagonitic rocks.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" by Various

One white ribbon- like layer of decomposed, pumiceous breccia, was curiously bent into deep unbroken curves, beneath each of the large fragments in the superincumbent stratum.

From Volcanic Islands by Darwin, Charles

For hundreds of miles of coast there is one great deposit composed of shells—a white pumiceous stone like chalk, including gypsum and infusoria.

From The World's Greatest Books — Volume 19 — Travel and Adventure by Hammerton, John Alexander, Sir

Half way up was a square enclosure of some greyish stone, which I found subsequently was built partly of coral and partly of pumiceous lava.

From The Island of Doctor Moreau by Wells, H. G. (Herbert George)

On one side of this island, however, a section is exposed, and cliffs of fine pumiceous ash appear stratified in the greater islands.

From COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 by Humboldt, Alexander von