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Vulcanicity :: Vulcanicity (n.) Volcanicity.

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..

Volcanian :: Volcanian (a.) Volcanic.

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

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

Belonite :: Belonite (n.) Minute acicular or dendritic crystalline forms sometimes observed in glassy volcanic rocks.

Mascagnite :: Mascagnite (n.) Native sulphate of ammonia, found in volcanic districts; -- so named from Mascagni, who discovered it..

Vulcanian :: Vulcanian (a.) Volcanic.

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..

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

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

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..

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..

Volcanically :: Volcanically (adv.) Like a volcano.

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..

Volcanization :: Volcanization (n.) The act of volcanizing, or the state of being volcanized; the process of undergoing volcanic heat, and being affected by it..

Volcanic :: Volcanic (a.) Of or pertaining to a volcano or volcanoes; as, volcanic heat..

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..

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..

Eruptive :: Eruptive (a.) Produced by eruption; as, eruptive rocks, such as the igneous or volcanic..

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