Agate is a term that includes numerous varieties of Chalcedony - a microcrystalline mineral of the Quartz family.  

In metaphysical terms, Agate is a stone of density + slower

vibrational frequencies.  It brings to mind the saying, ‘slow + steady wins the race’.  The stabilising energy of this stone brings a foundational strength + reminds us of the importance of strong roots + permanent bonds.