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Scum :: Scum (v.) The extraneous matter or impurities which rise to the surface of liquids in boiling or fermentation, or which form on the surface by other means; also, the scoria of metals in a molten state; dross..

Scorious :: Scorious (a.) Scoriaceous.

Peperino :: Peperino (n.) A volcanic rock, formed by the cementing together of sand, scoria, cinders, etc..

Scoriae :: Scoriae (pl. ) of Scori.

Cinder :: Cinder (n.) The slag of a furnace, or scoriaceous lava from a volcano..

Pumice :: Pumice (n.) A very light porous volcanic scoria, usually of a gray color, the pores of which are capillary and parallel, giving it a fibrous structure. It is supposed to be produced by the disengagement of watery vapor without liquid or plastic lava. It is much used, esp. in the form of powder, for smoothing and polishing. Called also pumice stone..

Scoriac :: Scoriac (a.) Scoriaceous.

Recrement :: Recrement (n.) Superfluous matter separated from that which is useful; dross; scoria; as, the recrement of ore..

Tufa :: Tufa () A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria..

Cone :: Cone (n.) Anything shaped more or less like a mathematical cone; as, a volcanic cone, a collection of scoriae around the crater of a volcano, usually heaped up in a conical form..

Escorial :: Escorial (n.) See Escurial.

Sullage :: Sullage (n.) The scoria on the surface of molten metal in the ladle.

Scoriaceous :: Scoriaceous (a.) Of or pertaining to scoria; like scoria or the recrement of metals; partaking of the nature of scoria.

Clinker :: Clinker (n.) Scoria or vitrified incombustible matter, formed in a grate or furnace where anthracite coal in used; vitrified or burnt matter ejected from a volcano; slag..

Scoria :: Scoria (n.) The recrement of metals in fusion, or the slag rejected after the reduction of metallic ores; dross..

Scoriform :: Scoriform (a.) In the form of scoria.

Shingling :: Shingling (n.) The process of expelling scoriae and other impurities by hammering and squeezing, in the production of wrought iron..

Slag :: Slag (v. t.) The scoria of a volcano.

Scorify :: Scorify (v. t.) To reduce to scoria or slag; specifically, in assaying, to fuse so as to separate the gangue and earthy material, with borax, lead, soda, etc., thus leaving the gold and silver in a lead button; hence, to separate from, or by means of, a slag..

Scoria :: Scoria (n.) Cellular slaggy lava; volcanic cinders.

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