The Mohs scale is used to test the hardness of different materials - talc is the softest and diamond is the hardest. Hardness is determined by a material's ability or inability to scratch itself or to scratch glass.
Fulgurites are hollow glass tubes that occur when lightning strikes quartzose sand, silica, or soil. They can only form when lightning strikes at a temperature of 1,800 degrees Celcius or 3,270 degrees Fahrenheit.
Your fireplace may be the focal point of your living room or den, but it can also be a danger zone. Glass fire screens keep sparks, coals, and hot ash contained to prevent fires while letting you have a relaxing view of the fire.
Safety glass is not just for use in automobiles; it has many practical applications in the home. There are two types of safety glass: laminated and tempered. The better choice depends on how the glass will be used.