Glass is mostly composed of the same material as sand (and can be made from sand): the chemical name is SiO2. This is combined with an alkali, usually sodium carbonate (Na2CO3) and calcium carbonate (CaCO3), and fused at very high temperatures.
Porcelain also contains silica (Si02) fused at high temperatures, but in this case it is mixed with clay and a mineral like feldspar or flint. There are many types of porcelain that use slightly differing amounts and types of minerals.
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