Grand Crosses

Hi; can anyone tell me if a grand cross requires that all the involved planets be in the same modality? (fixed, mutable, or cardinal)
I'm looking at a chart with 4 squares, 2 oppositions, all 4 elements represented -- all requirements for a grand cross -- but 2 planets are cardinals and 2 planets are fixed. It looks heavy/powerful, but I'm not sure if I can treat it as a grand cross... any thoughts welcome - thanks!
StarGirl

What are the orbs of aspect

You may want to list the sign and degree positions of the grand cross planets. It is the orbs or degrees of separation from exactness that figure into the aspect pattern's classification or its effectiveness. Dave