Petrified Wood

Petrified Wood is the name given to a special type of fossilized remains of terrestrial vegetation. It is the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization. All the organic materials have been replaced with minerals (mostly a silicate, such as quartz), while retaining the original structure of the stem tissue. Unlike other types of fossils which are typically impressions or compressions, petrified wood is a three-dimensional representation of the original organic material. 

Good for grounding and stabilizing one's emotions.  Particularly useful in calming survival-based fears.  Helps one be practical.  Stone of business success and general protection.