<P> Glass is a non-crystalline amorphous solid that is often transparent and has widespread practical, technological, and decorative usage in, for example, window panes, tableware, and optoelectronics . The most familiar, and historically the oldest, types of glass are "silicate glasses" based on the chemical compound silica (silicon dioxide, or quartz), the primary constituent of sand . The term glass, in popular usage, is often used to refer only to this type of material, which is familiar from use as window glass and in glass bottles . Of the many silica - based glasses that exist, ordinary glazing and container glass is formed from a specific type called soda - lime glass, composed of approximately 75% silicon dioxide (SiO), sodium oxide (Na O) from sodium carbonate (Na CO), calcium oxide (CaO), also called lime, and several minor additives . </P> <P> Many applications of silicate glasses derive from their optical transparency, giving rise to their primary use as window panes . Glass will transmit, reflect and refract light; these qualities can be enhanced by cutting and polishing to make optical lenses, prisms, fine glassware, and optical fibers for high speed data transmission by light . Glass can be coloured by adding metallic salts, and can also be painted and printed with vitreous enamels . These qualities have led to the extensive use of glass in the manufacture of art objects and in particular, stained glass windows . Although brittle, silicate glass is extremely durable, and many examples of glass fragments exist from early glass - making cultures . Because glass can be formed or moulded into any shape, it has been traditionally used for vessels: bowls, vases, bottles, jars and drinking glasses . In its most solid forms it has also been used for paperweights, marbles, and beads . When extruded as glass fiber and matted as glass wool in a way to trap air, it becomes a thermal insulating material, and when these glass fibers are embedded into an organic polymer plastic, they are a key structural reinforcement part of the composite material fiberglass . Some objects historically were so commonly made of silicate glass that they are simply called by the name of the material, such as drinking glasses and eyeglasses . </P>

Name two articles that can be made from glass
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