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pumiceous

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.03 sec.
pumiceous [pyü′mish·əs]
(geology)
Pertaining to the texture of a pyroclastic rock, such as pumice, characterized by numerous small cavities presenting a spongy, frothy appearance.


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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.
These beds are covered by others of a peculiar soft white stone, including much gypsum, and resembling chalk, but really of a pumiceous nature.
 
 
 
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