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CAS Number: 1304-76-3
Linear Formula: Bi2O3
Molecular Weight: 465.96
IUPAC Name: Bismuth trioxide Bismuth(III) oxide
Other Names: Bismite, Bismuth sesquioxide
Bismuth(III) oxide is perhaps the most industrially important compound of bismuth. It is also a common starting point for bismuth chemistry. It is found naturally as the mineral bismite (monoclinic) and sphaerobismoite (tetragonal, much more rare), but it is usually obtained as a by-product of the smelting of copper and lead ores.
Bismuth trioxide is commonly used to produce the "Dragon's eggs" effect in fireworks, as a replacement of red lead.