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Reference.org
Germanium dioxide
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<p>Germanium dioxide, also called germanium(IV) oxide, germania, and salt of germanium, is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the chemical formula <a href="/facts/Germanium/wtoALHGs">Ge</a><a href="/facts/Oxide/DXtoVe1C">O</a>2. It is the main commercial source of germanium. It also forms as a <a href="/facts/Passivation_(chemistry)/tPADJj5G">passivation layer</a> on pure germanium in contact with atmospheric oxygen. </p>