What is the material for the Christmas glass ball ?

The Christmas glass ball definitely made of glass. Most Christmas glass ball factory will tell you is high quality glass or high boron silicon glass,actually they are the same material to created the Christmas glass ball . The main raw material are quartz sand ,feldspar,calcite, NATRII SULFAS .The these mineral must be heated to over 1,000 degrees to react to form liquid glass then become the material of Christmas glass ball material .