Cross quartz crystal presents in a “cross” or “X” shaped configuration. The “cross” may present as a traditionally shaped cross, or an X, with differing angles and degrees between the two (not necessarily 90 degrees to one another).
Cross quartz crystal is helpful in decision making (think “Cross Road”). One crystal representing one option, the other representing the other. Where they intersect shows you how choosing one option over another may lead in a different direction.
In the same way, Cross quartz crystal also represents options (this way or that), can teach tolerance (working with opposing views) and may help with conflict resolution.