Rotating the glass slowly over the candle, making sure to concentrate the flame on the line I had scored, I heated up my bottle for around 10 minutes. 3. Cool it down. When I felt enough time had ... 1. Quartz Mining. Quartz, also known as glass-sand or silica sand is a type of sand that is commonly used in the glass manufacturing industry. Quartz is used in manufacturing glass bottles, optical instruments, windows, electrical insulation, doors, aircraft parts, and other glass ware.