In Iago’s soliloquy, he confesses he is jealous and compares jealousy to “a poisonous mineral” (289).
Is there any coordinating logic between sexual jealousy, career jealousy, and racism?
All of these are connected. Iago's logic isn't logical rather than scattered obsessive emotions which include sexual jealousy, career jealousy, and racism. Iago thinks Othello slept with his wife. Iago perhaps covets Othello's hypermasculine traits: traits that he feels lacking in himself. Iago of course complains about Cassio being favoured for promotion over him.
