Tellurite is a soft secondary mineral, an oxide of tellurium. It occurs sparingly in tufts of white or yellowish crystals formed through the oxidation of pre-existent tellurium compounds or of the element itself. Tellurite is most commonly associated with paratellurite with which it is dimorphous. Tellurite was confirmed as a distinct species of mineral in 1845 and is named after its main elemental component, tellurium. Tellurite has a relative hardness of 2. Research Tellurite
 
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