Base: 2in, Cap: 3/4. A little deeper in the back.
Azomite, that is correct and it is very dusty, even in water. I wish I could find the article where it was listed as a good ingredient for a dirted tank. I also read that it is great for shrimp (strengthen their shell).
Is there something I don't know about the azomite?
I haven't checked the hardness yet but I will start to include it in the updates.