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Term for a glassy effusive rock (volcanic glass, obsidian) formed by chemical and physical processes. At an advanced stage of transformation, a loose rock of bluish-green, brownish or grey colour is formed. Pearlite is used for many purposes such as in the building industry. In winemaking it is used as a filter aid during filtration. The rock is also used in the cultivation of vines (see also under vine nursery).

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