pumiceous


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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.
References in periodicals archive ?
1%, < 1 mm vesicular pores; few 1-2 mm vertical and horizontal roots; indistinct, discontinuous boundary because of pods of younger pumiceous tephra from above.
These differences appear related to coarse, pumiceous soils and steeper slopes on Pine Creek Ridge.
Champion has found that the quickly cooled pumiceous ash deposits contain essentially one kind of self-reversing titanohematite, whereas lava that cooled slowly in the domes at the surface contains a potpourri of differently composed titanohematites.