In its pure form glass is a transparent, strong, hard-wearing, essentially inert, and biologically inactive material that can be formed with very smooth and impervious surfaces. Glass is, however, brittle and will break into sharp shards. These properties can be modified or changed with the addition of other compounds or heat treatment.
Common glass contains about 70% amorphous silicon dioxide (SiO2), which is the same chemical compound found in quartz and in its polycrystalline form, sand.
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