A tellurite (compound), for example sodium tellurite, is a compound that contains this ion. Upon acidification of aqueous solutions of tellurite salts, solid hydrated tellurium dioxide (TeO) precipitates. Sodium tellurite (NaTeO) is lethal in amounts of around 2 grams. Potassium tellurite, KTeO, is an inorganic potassium-tellurium compound. Tellurite dianion is pyramidal, like selenite and sulfite. The shortest Te-Te distance in tellurite is 317 pm, compared to 374 pm in paratellurite. When fused with nitrate salts, tellurite salts oxidize to tellurates (). A mineral with the formula TeO is called tellurite. Tellurite is a rare oxide mineral composed of tellurium dioxide (TeO).