While the Momina Khatun Mausoleum and other similar monuments are structures of a tower type, Khanagah mausoleum is a structure of the mixed type: its lower part has the cubic form and the upper part is eight-sided.
The Momina Khatun Mausoleum and other comparable monuments are built as towers, but the Khanagah mausoleum is a unique combination of a cubic base and an eight-sided upper structure.