I dont have the ability to evaluate or make a judgment about specific materials, especially regarding the suitability of the material for specific applications. However, in general, marble is a porous and soft stone that can be susceptible to fading and discoloration when exposed to outdoor weather, particularly in sunny and humid climates. It is recommended to consult with a professional or the supplier of the marble to determine its specific characteristics and suitability for exterior use. Additionally, proper sealing and maintenance can help prolong the lifespan and appearance of the marble.