pumice

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Related to pumiceous: scheduled, seek out, passed on

pumice

 [pum´is]
a substance consisting of silicates of aluminum, potassium, and sodium; used in dentistry as an abrasive.

pum·ice

(pŭm'is),
Volcanic cinders ground to particles of varying sizes; used in dentistry for polishing restorations or teeth; an abrasive.
[L. pumex (pumic-), a pumice stone]

pum·ice

(pŭm'is)
Volcanic cinders ground to particles of varying sizes; used in dentistry for polishing restorations or teeth; an abrasive.
[L. pumex (pumic-), a pumice stone]
References in periodicals archive ?
strong brown at base and very dusky red (2.5YR 2.5/4) at top, clay; < 5% sub-rounded coarse fragments up to 70 mm; very sticky, very plastic, very firm; strongly developed 10-100 mm blocky breaking to crumb structure; thin waxy chocolate coloured argillans on larger aggregates and in voids and root channels; > 2%, 1-5 mm tubular pores; few 1-10 mm vertical and horizontal, fine and coarse roots; gradational, smooth boundary with large lenses and vertical channels up to 15 cm across of younger pumiceous tephra from above extending down into this horizon; rare sub-rounded stones up to 70 cm.
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.
The Awaiti sandy loam is developed from thin Tarawera tephra on fine pumiceous alluvium, chiefly derived from Kaharoa Ash and is moderately well drained.