Small piece of a branch of a tree has be completely transitioned to stone by the process of Permineralization. All the organic material has been replaced with minerals (mostly Silicate such as Quartz) The petrification occurrs underground when it becomes buried under sediment or volcanic ash.
The fossilisation quartz is colourless but when contaminants are added to the process the crystals take on other tints. The following list is the elements and relating colour hues. Carbon – Black: Cobolt – Green or Blue: Chromium – Green or Blue: Copper – Green or Blue: Iron Oxides – Red, Brown and Yellow: Manganese – Pink or Orange: Manganese Oxides – Blackish Yellow:
Fossil size 2″ x 1″ inches.
The Late Triassic Period 220 million years ago.