Characterization of karak clay from pakistan for pharmaceutical and cosmetic applications - Shah, Liaqat Ali; Silva-Valenzuela, Maria das Graças da; Sayeg, Isaac Jamil; Carvalho, Flavio Machado de Souza; Valenzuela Díaz, Francisco Rolando; Khattak, Nazir Shah (Congresso Brasileiro de Cerâmica, 2012)