what metalloid is used for making prisms and lenses
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Antimony
Explanation:
Antimony oxide is a white powder derived from the mineral stibnite (antimony sulphide) or formed by the oxidation of antimony metal or as a by-product of antimonial-lead alloy refining. It acts as a metal at times and as a non-metal at other times. Tiny percentages of antimony oxide are used in the glass industry to eliminate bubbles in optical glass, to decolorize specialty glasses, and to stabilise emerald green glass. In higher temperature glazes, it is slightly fluxing.
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