Though one may find a crystal that helps them link into the frequency of Atlantis - what it is doing is allowing themsleves to connect with the grids that formed the Atlantean Program - or using the energies of the crystal - based on its shape and vibrational frequency to trigger a memory in them about that civilization. 

These crystals may be found anywhere on the planet.  They usually call to the person who links with them on the same frequency signature.

This is a balanced triangular prism.  They generally measure 4-6  inches in length with a center diameter of one inch.  They contain  a colorful frequency that is either clear or pale amythest.

This crystal has its widest diameter located near the base.   It measures 6-10 inches in length.  It is clear in color.

To function properly these crystals must be in perfect condition. They contain 6 sides--and  6 facets on the top and on the bottom.

Seed crystals are for transformation. They are very powerful and transmute high energies.

Love Star Crystals They supposedly grew in Atlantis as we grow flowers now.

They grew in clusters.  They could be given as gifts.
They were used for healing the heart.
They were clear in color.

If found a crystal of this type can awaken Atlantean  energies in the person using it.