There exists a base for materials that far outshines any other. The remnant material from setting Astral against the universal corrupter, Curse: Creation Salts. It will appear about a quarter of the time. Watch as aspects of reality flash on its surface, then fade away...
It can also be created as an item with a simple transmutation.
Of course, its block and item forms are interchangeable.
This base yields 16 material blocks for each input, and it doubles the effectiveness of the Powers used.
At such extreme concentrations, new Properties may assert themselves.