Petrified Wood, this stone(wood)is an excellent grounding stone. Used to strengthen one's back. Aids one in coping during a crisis and said to help one to understand suffering. Petrified Wood in the late tertiary period, blankets if rain-forest surrounding volcanoes were plentiful throughout Indonesia. After volcanic eruption these trees were buried by ash and lava eliminating any microbes that would rot the wood. The wood was then replaced with silica-rich minerals such as chalcedony, quartz, calcite, opal and jasper. The beautiful colors in the wood come from assorted trace elements. Traces of manganese create blue and black colors and traces of iron would result in different shades of brown and orange. This petrified wood found in Indonesia is more than 200 million years old.