Marble in Hades 2 is just one of the resources Melinoe will need to defeat Chronos. Of the extensive list of items available, Marble is probably the most difficult to find. You’ll need to complete all of the biomes and reach Tartarus to obtain this resource. But you certainly shouldn’t assume that Marble will be everywhere in this region. Obtaining it is a whole other task. To help you through it, here’s our Hades 2 guide explaining where and how to collect Marble.
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To find Marble, you will need to enter the Tartarus biome by completing Erebus, Oceanus, and the Fields of the Mourning biomes. To reach Tartarus, you will need to defeat the Infernal Cerberus boss fight in the Fields of the Mourning. Once in Tartarus, explore and look out for white busts/sculptures. These white busts can be destroyed to obtain Marble in Hades 2.
Make sure you have a Crescent Pick with you when you're looking for Marble. Those white statues can only be destroyed with this Gathering Tool. The location of the statues is completely random at the moment, so there's no set place to farm it.
Since the use of marble in Hades 2 is limited, you may not need it very often. However, if you do need it, you can start over, reach Tartarus, break white busts and get it.