How to produce blue glass rocks?

Cobalt glass rocks are made from a combination of ingredients, including silica sand, soda ash, limestone, and cobalt oxide. The silica sand is used as the main ingredient in the glass mixture, while the soda ash is added to lower the melting point of the sand and help it fuse together more easily. Limestone is added to improve the stability of the glass, making it less prone to cracking or breaking.

The addition of cobalt oxide is what gives cobalt glass rocks their distinctive blue color. Cobalt oxide is a dark blue powder that is mixed with the other glass ingredients before they are melted together in a furnace. The amount of cobalt oxide used in the mixture can vary depending on the desired shade of blue.

Other components may be added to the glass mixture depending on the desired properties of the finished product. For example, some manufacturers may add boron to the mixture to make the glass more resistant to thermal shock, or alumina to make it more resistant to chemical corrosion.

Overall, the components of cobalt glass rocks are similar to those of other types of glass rocks, with the addition of cobalt oxide to produce the distinctive blue color.