Glass is made from silica, also known as sand.
Glass is made from sand and soda ash. Glass is not made from carbon, which is an element that makes up organic materials. Carbon is not used in glass making because it's an element that bonds strongly with other chemical elements (such as oxygen), so it would be very difficult to remove it from the glass once it was added.
The chemical formula of glass is SiO2 + Na2CO3 + CaCO3 + K2O, where SiO2 stands for silicon dioxide (the most common mineral in Earth's crust), Na2CO3 stands for sodium carbonate (a white crystalline substance found in many natural springs), CaCO3 represents calcium carbonate (a compound found in limestone and shells), and K2O stands for potassium oxide (a salt).
The first step in the process of creating glass is to mix sand and soda ash. Sand is made of tiny, hard particles that are mostly silicon dioxide (SiO2). Soda ash is a chemical compound made from sodium carbonate (Na2CO3) and sodium bicarbonate (NaHCO3). When you heat these two compounds together at high temperatures, they undergo a chemical reaction known as fusion. During fusion, the cells inside each particle break apart and rearrange themselves into larger structures called crystals; this forms a new substance called glass.
You may already know that carbon is a non-metal element. But did you know that it makes up organic materials such as diamond, graphite, and coal? Carbon is an essential element for life on Earth and can be found in all living things.
Carbon is the fourth most common element in the universe. Glass does not contain carbon, therefore it's impossible to make glass from carbon.