Final answer:
The commercial sources of iron are the minerals hematite and magnetite, which are mined and processed for industrial use.
Step-by-step explanation:
The two minerals that are commercial sources of iron are hematite and magnetite. Hematite has a typical red-brown streak, while magnetite leaves a black streak.
These minerals are extracted from the earth and processed to get iron for commercial use in various industries including construction and manufacturing.