pumice

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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 ?
The ash from the March 12, 2015 eruption differs from the 2014 eruptions in that it shows a ~10 vol.% content of unaltered tachylitic scoria, ~7 vol.% of unaltered vesiculated sideromelane grains, as well as unaltered olivine (3 vol.%) and plagioclase (4 vol.%) free crystals.
So if not resulting from a cosmic impact, where did the scoria droplets come from?
The first phreatomagmatic explosion (the Rajov maar) consumed all water available for phreatomagmatic eruptions and subsequent activity took place in Strombolian style building up a scoria cone of the Podhorni vrch volcano and emitting a lava flow, which filled partly the maar crater (Fig.
In the later zone, the shield volcanoes form a WNW-ESE chain (80 km long, 8 km wide), which are associated with scoria, spatter, and clastogenic cones, such as Qarat al-Gharbiyat (660 m), Qarat Safra (625 m), and al-Qaraniyat (700 m).
In this way the Shino we do not know returns to us and becomes so familiar, it is us, it is the others, it is ready to let itself be mixed by younger hands, gazed at by young eyes saturated by images searching for forms free of scoria and worldly turbulence.
Before joining Merrill he was senior vice president at Barclays Bank and prior to Barclays he originated and structured real estate loans for the Bank of Nova Scoria.
The moai were not only immense, but to literally top them off, many were adorned with red stone hairpieces (the red stone is actually scoria, the ashes of lava).
* Scoria rocks--reserves of 613 million cubic metres are estimated in Yemen, with high porosity, low specific gravity and great strength: good fillers for lightweight aggregate and concrete blocks.
The surface mimics the lightness of ancient sheets of parchment; it is constructed as a fabric, woven with warp and woof, but contains scoria and fragments of drawings, lacerations and clots of material.
Different building materials contain suitable aggregates, such as quartz, gravel, crushed stone, bituminous or anthracite cinders, burned clay or shale, and pumice or volcanic scoria, all of which may indicate a particular geographic area.
"Because of our involvement in this subsea cabling project, we became aware of a vessel that had been started at a Gulf Coast shipyard and later completed in Nova Scoria.
Each October, he scours the sagebrush and scoria of eastern Montana, assisting disabled Vietnam veterans who, thanks to the generosity of Doonan Gulch Outfitters and VFW, have come to hunt antelope under the Big Sky.