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alloy, background, basic material, chemical, chemical element, chemistry, crystal, element, elemental, freiberg, geology, germany, glossy, group, high purity, highly pure, industrial, industry, isolated, mashed potato, material, metallic, metallurgy, mineral, mineral resource, mineral resources, mining, periodic, periodic system, polycrystalline, polysilicon, production, purity, raw, resource, science, semiconductor, semiconductor industry, shiny, si, silicon, solid, stone, very pure, white,