Microscopically, only one crystal has atoms inside a near-ideal periodic arrangement; a polycrystal is composed of numerous microscopic crystals; and an amorphous sound including glass has no periodic arrangement even microscopically. Early glass was not often transparent and often contained impurities and imperfections,[21] and is technically faience rather then legitimate https://commercial75319.wikiannouncing.com/5308227/details_fiction_and_commercial