It's most notable features is the
minaret The mosque is one of very few in Morocco with an octagonal, rather than square minaret. Crenelated at the summit, and elaborately decorated with carved stucco, and a mosaic pattern in green, yellow, and blue tiles, the minaret was most likely built by Ali's successor, Pasha Ahmed, who was responsible for a number of octagonal minarets in the Rif region of Morocco.
Recently the mosque underwent a major renovation that took over a year. It will reopened in early June 2015.
-Michael A. Toler, Content Manager, AKDC @MIT, June 2015
Boujibar, Naïma El-Khatib, "Ports on the Straits" in
Museum With No Frontiers. Andalusian Morocco: A Discovery in Living Art. Vienna: Museum With No Frontiers, 2002.
Guiguet-Bologne, Philippe.
Un guide de Tanger et de sa région. 20 Tanger, Maroc: Litograf, 1996.
"Ibn Abbou, Mezquita De La Kasba." Tanger. El
Mundo En Una Ciudad. Accessed March 10, 2015.
http://tingisaecid.com/v2/view_ent/view_building.php?id=161.
Roca, Juan Ramón.
Tangier and Its Surroundings, Assilah and Chefchaouen An Illustrated Guide. 102. Alicante (C/ San Carlos, 93, 03013 Alicante): J.R. Roca, 2011.