Geodes normally are no bigger than a football, some can form very large. These geodes are one point two metres high they were excavated from rocks in Southern Brazil near the border with
consist of a hollow rock lined with crystals. The geodes form from gas that was trapped the earth millions of years ago. Later hot mineralised solutions permeated into the hollow cavity and
quartz-based the purple coloured quartz called amethyst. The colour mainly comes from iron and manganese that is altered by natural radiation to give the purple colour. Amethyst is also known as
the master healer.