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Fiorite :: Fiorite (n.) A variety of opal occuring in the cavities of volcanic tufa, in smooth and shining globular and botryoidal masses, having a pearly luster; -- so called from Fiora, in Ischia..

Pozzolana :: Pozzolana (n.) Volcanic ashes from Pozzuoli, in Italy, used in the manufacture of a kind of mortar which hardens under water..

Volcanism :: Volcanism (n.) Volcanic power or action; volcanicity.

Vent :: Vent (n.) A small aperture; a hole or passage for air or any fluid to escape; as, the vent of a cask; the vent of a mold; a volcanic vent..

Leucite :: Leucite (n.) A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especially at Vesuvius..

Vesicle :: Vesicle (n.) A small cavity, nearly spherical in form, and usually of the size of a pea or smaller, such as are common in some volcanic rocks. They are produced by the liberation of watery vapor in the molten mass..

Fumarole :: Fumarole (n.) A hole or spot in a volcanic or other region, from which fumes issue..

Volcanity :: Volcanity (n.) The quality or state of being volcanic, or volcanic origin; volcanicity..

Sulphur :: Sulphur (n.) A nonmetallic element occurring naturally in large quantities, either combined as in the sulphides (as pyrites) and sulphates (as gypsum), or native in volcanic regions, in vast beds mixed with gypsum and various earthy materials, from which it is melted out. Symbol S. Atomic weight 32. The specific gravity of ordinary octohedral sulphur is 2.05; of prismatic sulphur, 1.96..

Lithophyse :: Lithophyse (n.) A spherulitic cavity often with concentric chambers, observed in some volcanic rocks, as in rhyolitic lavas. It is supposed to be produced by expanding gas, whence the name..

Solfatara :: Solfatara (n.) A volcanic area or vent which yields only sulphur vapors, steam, and the like. It represents the stages of the volcanic activity..

Trass :: Trass (n.) A white to gray volcanic tufa, formed of decomposed trachytic cinders; -- sometimes used as a cement. Hence, a coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water..

Vulcanicity :: Vulcanicity (n.) Volcanicity.

Etnean :: Etnean (a.) Pertaining to Etna, a volcanic mountain in Sicily..

Crystallite :: Crystallite (n.) A minute mineral form like those common in glassy volcanic rocks and some slags, not having a definite crystalline outline and not referable to any mineral species, but marking the first step in the crystallization process. According to their form crystallites are called trichites, belonites, globulites, etc..

Volcanic :: Volcanic (a.) Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa..

Volcanicity :: Volcanicity (n.) Quality or state of being volcanic; volcanic power.

Volcanize :: Volcanize (v. t.) To subject to, or cause to undergo, volcanic heat, and to be affected by its action..

Agglomerate :: Agglomerate (n.) A mass of angular volcanic fragments united by heat; -- distinguished from conglomerate.

Volcanian :: Volcanian (a.) Volcanic.

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