This study examines the mineralogical characteristics and the metamorphic evolution of the aluminosilicate bearing rocks, focusing on andalusite–sillimanite schists, hornfelses, and migmatites in the Hamedan region. These rocks display diverse mineral assemblages, including quartz, muscovite, biotite, andalusite, sillimanite, fibrolite, garnet, tourmaline, and graphite, reflecting both regional and contact metamorphic processes associated with the Alvand Intrusive Complex. Andalusite is widespread but often occurs with sillimanite or staurolite crystals, forming poikiloblastic porphyroblasts that -reflect retrograde alteration to muscovite and biotite crystals. Fibrolite, a fine grained variety of sillimanite, forms through various pathways such as metasomatism, deformation, and the breakdown of biotite, andalusite, and garnet—particularly near pegmatite dikes. Sillimanite commonly develops from fluid assisted replacement of andalusite and is classified into four textural types based on its morphology and growth patterns. Paragenetic analysis indicates metamorphic conditions at pressure of 2–3 kbar and temperatures between 376 to 617 °C. Migmatites show features of partial melting and mineral segregation, with sillimanite, garnet, and andalusite commonly forming as porphyroblasts. Overall, the micro-textural and mineralogical relationships confirm a complex metamorphic history and polymorphic transformations of aluminosilicates in this area.