Final Answer:
The mineral described as metallic, softer than glass, bronze-brown to tarnish-purple, usually massive, granular, or compact, and often associated with chalcopyrite is bornite.
Step-by-step explanation:
The mineral described in the question exhibits characteristics typical of bornite, which is a copper ore mineral. Bornite is a metallic mineral with a bronze-brown color that tarnishes to a purple hue. It has a relatively soft hardness compared to glass, and it is commonly found in massive, granular, or compact forms. Bornite is often associated with chalcopyrite in mineral deposits. Chalcopyrite is another copper ore mineral that shares similar physical properties. Therefore, the correct answer is Bornite.